Samacheer Kalvi Class 11 Bio Zoology Solutions Chapter 9 Locomotion and Movement

11th Bio Zoology Guide Locomotion and Movement Text Book Back Questions and Answers

Part I

 

Question 1. Muscles are derived from
(a) ectoderm
(b) mesoderm
(c) endoderm
(d) neuro ectoderm
Answer: (b) mesoderm
In simple words: The mesoderm is one of the three main layers of cells that form in a very early embryo. It develops into many body parts, including all types of muscles.

🎯 Exam Tip: Remember the three primary germ layers (ectoderm, mesoderm, endoderm) and the main tissues they form. This helps in understanding developmental biology.

 

Question 2. Muscles are formed by
(a) myocytes
(b) leucocytes
(c) osteocytes
(d) lymphocytes
Answer: (a) myocytes
In simple words: Myocytes are special cells that are the building blocks of all muscle tissue. They can contract, which allows muscles to move.

🎯 Exam Tip: Understand the basic cell types for different tissues: myocytes for muscle, osteocytes for bone, and leucocytes/lymphocytes for blood/immune function.

 

Question 3. The muscles attached to the bones are called
(a) skeletal muscle
(b) cardiac muscle
(c) involuntary muscle
(d) smooth muscles
Answer: (a) skeletal muscle
In simple words: Skeletal muscles are the type of muscles connected to our bones and help us move voluntarily, like when we walk or lift something. These muscles are usually under our conscious control.

🎯 Exam Tip: Distinguish between the three types of muscles: skeletal (voluntary, attached to bones), cardiac (involuntary, heart), and smooth (involuntary, internal organs).

 

Question 4. Skeletal muscles are attached to the bones by
(a) tendon
(b) ligament
(c) pectin
(d) fibrin
Answer: (a) tendon
In simple words: Tendons are strong, cord-like tissues that connect muscles to bones, allowing muscles to pull on bones and create movement. They are essential for transmitting force from muscle to bone.

🎯 Exam Tip: Know the difference: Tendons connect muscle to bone, while ligaments connect bone to bone.

 

Question 5. The bundle of muscle fibres is called
(a) Myofibrils
(b) fascicle
(c) sarcomere
(d) sarcoplasm
Answer: (b) fascicle
In simple words: A fascicle is a small group or bundle of muscle fibers, all wrapped together by connective tissue. Many such fascicles then group to form a whole muscle.

🎯 Exam Tip: Remember the organizational hierarchy of a muscle: Muscle > Fascicle > Muscle Fiber > Myofibril.

 

Question 6. The pigment present in the muscle fibre to store oxygen is
(a) myoglobin
(b) troponin
(c) myosin
(d) actin
Answer: (a) myoglobin
In simple words: Myoglobin is a protein found in muscle tissue that binds and stores oxygen, ready to be used by the muscle for energy when needed. This is similar to how hemoglobin stores oxygen in blood.

🎯 Exam Tip: Myoglobin's presence is why red muscle fibers appear red, as it contains iron and gives them their color.

 

Question 7. The functional unit of a muscle fibre is
(a) sarcomere
(b) sarcoplasm
(c) myosin
(d) actin
Answer: (a) sarcomere
In simple words: The sarcomere is the smallest part of a muscle that can contract. It is made of actin and myosin proteins and is responsible for muscle shortening.

🎯 Exam Tip: Visualize the sarcomere as the repeating unit within a muscle fiber that shortens during contraction, like tiny springs pulling together.

 

Question 8. The protein present in the thick filament is
(a) myosin
(b) actin
(c) pectin
(d) leucin
Answer: (a) myosin
In simple words: Myosin is a key protein that forms the thick filaments in muscle cells. It works with actin to create muscle contractions.

🎯 Exam Tip: Remember that myosin forms the thick filaments, and actin forms the thin filaments; their interaction is central to muscle contraction.

 

Question 9. The protein present in the thin filament is
(a) myosin
(b) actin
(c) pectin
(d) leucin
Answer: (b) actin
In simple words: Actin is a protein that makes up the thin filaments in muscle cells. It slides past myosin to make muscles contract.

🎯 Exam Tip: Understanding the roles of actin and myosin in the sliding filament theory is crucial for describing muscle contraction.

 

Question 10. The region between two successive Z-discs is called a
(a) sarcomere
(b) microtubule
(c) myoglobin
(d) actin
Answer: (a) sarcomere
In simple words: The sarcomere is the basic unit of muscle, stretching between two Z-discs. It is the part that shortens when a muscle contracts.

🎯 Exam Tip: The Z-discs act as boundaries for each sarcomere, defining its length and structure within the myofibril.

 

Question 11. Each skeletal muscle is covered by
(a) epimysium
(b) perimysium
(c) endomysium
(d) hypomysium
Answer: (a) epimysium
In simple words: The epimysium is a tough outer layer of connective tissue that surrounds an entire skeletal muscle, holding all its fascicles together. It helps to protect the muscle and allows it to glide over other structures.

🎯 Exam Tip: Learn the three connective tissue coverings of muscle: epimysium (whole muscle), perimysium (fascicle), and endomysium (individual fiber).

 

Question 12. Knee joint is an example of
(a) saddle joint
(b) hinge joint
(c) pivot joint
(d) gliding joint
Answer: (b) hinge joint
In simple words: A hinge joint, like the knee, allows movement mainly in one direction, similar to how a door hinge works, enabling bending and straightening. This type of joint provides strong, stable movement in a single plane.

🎯 Exam Tip: Understand common joint types and provide examples: hinge (knee, elbow), pivot (atlas and axis), ball-and-socket (shoulder, hip), saddle (thumb), gliding (wrist, ankle).

 

Question 13. Name of the joint present between the atlas and axis is
(a) synovial joint
(b) pivot joint
(c) saddle joint
(d) hinge joint
Answer: (b) pivot joint
In simple words: The joint between the atlas and axis bones in the neck is a pivot joint, which allows the head to rotate from side to side. This rotation is crucial for head movements like shaking your head "no".

🎯 Exam Tip: Remember specific examples for each joint type, as they often appear in exams.

 

Question 14. ATPase enzyme needed for muscle contraction is located in
(a) actinin
(b) troponin
(c) myosin
(d) actin
Answer: (c) myosin
In simple words: The ATPase enzyme, which breaks down ATP to provide energy for muscle contraction, is found in the heads of myosin filaments. This energy release powers the 'power stroke' of muscle contraction.

🎯 Exam Tip: Connect the ATPase activity with myosin to the energy requirements for the sliding filament mechanism.

 

Question 15. Synovial fluid is found in
(a) Ventricles of the brain
(b) Spinal cord
(c) immovable joint
(d) freely movable joints
Answer: (d) freely movable joints
In simple words: Synovial fluid is a thick liquid found in freely movable joints (synovial joints) like knees and shoulders. It acts like oil to lubricate the joint and reduce friction, allowing smooth movement.

🎯 Exam Tip: Synovial fluid is a key characteristic of synovial joints, facilitating their wide range of motion and preventing wear and tear.

 

Question 16. Inflammation of joints due to accumulation of uric acid crystals is called as
(a) Gout
(b) myasthenia gravis
(c) osteoporosis
(d) osteomalacia
Answer: (a) Gout
In simple words: Gout is a painful condition where uric acid crystals build up in the joints, causing inflammation, swelling, and severe pain. It often affects the big toe first.

🎯 Exam Tip: Distinguish between different joint disorders and their causes; gout is specifically linked to uric acid crystal buildup.

 

Question 17. Acetabulum is located in
(a) collar bone
(b) hip bone
(c) shoulder bone
(d) thigh bone
Answer: (b) hip bone
In simple words: The acetabulum is a cup-shaped hollow in the hip bone where the head of the thigh bone (femur) fits, forming the hip joint. This strong socket allows for a wide range of leg movements.

🎯 Exam Tip: Knowing the names and locations of key bone structures like the acetabulum helps in understanding skeletal anatomy.

 

Question 18. Appendicular skeleton is
(a) girdles and their limbs
(b) vertebrae
(c) skull and vertebral column
(d) ribs and sternum
Answer: (a) girdles and their limbs
In simple words: The appendicular skeleton includes the bones of your arms, legs, shoulders, and hips. These parts are responsible for most of the body's movement and carrying weight.

🎯 Exam Tip: Remember the two main divisions of the human skeleton: axial (skull, spine, rib cage) and appendicular (limbs and girdles).

 

Question 19. The type of movement exhibits by the macrophages are
(a) flagellar
(b) ciliary
(c) muscular
(d) amoeboid
Answer: (d) amoeboid
In simple words: Macrophages are immune cells that move by changing their shape, extending parts called pseudopodia. This "amoeboid" movement allows them to crawl through tissues to find and engulf harmful invaders.

🎯 Exam Tip: Amoeboid movement is characteristic of certain cells like amoeba and white blood cells, allowing them to engulf particles and move through tissues.

 

Question 20. The pointed portion of the elbow is
(a) acromion process
(b) glenoid cavity
(c) olecranon process
(d) symphysis
Answer: (c) olecranon process
In simple words: The olecranon process is the bony tip of your elbow. It's part of the ulna bone and forms the point of the elbow that you can feel.

🎯 Exam Tip: Familiarize yourself with anatomical landmarks and their correct names to avoid confusion.

 

Question 21. Name the different types of movement
Answer:

• Amoeboid movement
• Ciliary movement
• Flagellar movement
• Muscular movement

In simple words: Living things can move in different ways, like cells crawling (amoeboid), tiny hairs sweeping (ciliary), whip-like tails moving (flagellar), or muscles making body parts shift (muscular). These different movements help organisms perform various functions like feeding, cleaning, or getting around.

🎯 Exam Tip: When listing types of movement, try to briefly recall an example for each type to solidify your understanding.

 

Question 22. Name the filaments present in the Sarcomere.
Answer: Thick and thin filaments are the two types of filaments present inside the sarcomere. The main proteins in these filaments are myosin (thick) and actin (thin).
In simple words: The sarcomere, which is the basic unit of muscle, has two main types of tiny threads: thick ones made of myosin protein and thin ones made of actin protein. These threads slide past each other to make the muscle contract.

🎯 Exam Tip: Always specify the key proteins associated with thick (myosin) and thin (actin) filaments for a complete answer.

 

Question 23. Name the contractile proteins present in the skeletal muscle.
Answer:

• Myosin – This protein makes up the thick filaments.
• Actin – This protein makes up the thin filaments.

In simple words: The two main proteins that help skeletal muscles shorten and move are myosin (found in thick strands) and actin (found in thin strands). They work together by sliding over each other.

🎯 Exam Tip: Clearly state both actin and myosin, and if possible, mention their respective roles (thick vs. thin filaments) to add detail.

 

Question 24. When describing a skeletal muscle. What does "Striated mean?
Answer: Skeletal muscle fibers have repeated patterns of dark and light bands. The dark A-bands and light I-bands give the muscle a striped, or "striated," look. These stripes are a visible sign of how the muscle is organized for contraction.
In simple words: "Striated" means that skeletal muscles look striped. This is because they have repeating patterns of dark and light bands when viewed under a microscope.

🎯 Exam Tip: When explaining "striated," clearly link it to the alternating dark (A-band) and light (I-band) patterns visible in the muscle fibers.

 

Question 25. How does an isotonic contraction takes place?
Answer: In isotonic contraction, the muscle's length changes while the tension (force) it produces stays constant. This type of contraction results in movement, such as lifting dumbbells or lifting other weights. During isotonic contractions, the muscle shortens or lengthens as it moves a load.
In simple words: Isotonic contraction is when a muscle changes its length while keeping the same amount of force. For example, lifting a dumbbell causes the muscle to shorten but maintain a constant force.

🎯 Exam Tip: The key feature of isotonic contraction is movement of a load, with muscle length changing and tension remaining constant.

 

Question 26. How does an isometric contraction take place?
Answer: In isometric contraction, the muscle produces force, but its length does not change, and the tension remains constant. The force produced is unchanged, even when the muscle is trying to move an immovable object, for example, pushing against a wall or holding dumbbells still in one position. These contractions are important for maintaining posture.
In simple words: Isometric contraction happens when a muscle creates force but does not change its length. For instance, pushing against a wall involves muscle effort, but the wall doesn't move, and your muscle length stays the same.

🎯 Exam Tip: The key characteristic of isometric contraction is force generation without any change in muscle length or joint movement.

 

Question 27. Name the bones of the skull.
Answer: The cranial bones of the skull are 8 in number. They protect the brain.
1. Paired parietal
2. Paired temporal
3. frontal
4. Sphenoid
5. Occipital
6. Ethmoid
In simple words: The skull has eight cranial bones that cover and protect the brain. These include bones like the parietal, temporal, frontal, sphenoid, occipital, and ethmoid.

🎯 Exam Tip: When listing bones, it's helpful to specify if they are paired or unpaired, as this demonstrates a deeper understanding of anatomy.

 

Question 28. Which is the only jointless bone in the human body?
Answer: The hyoid bone, found in our throat, is the only bone in the human body that does not connect directly to any other bone. This horseshoe-shaped bone is important for swallowing and speech.
In simple words: The hyoid bone in our throat is the only bone that is not connected to any other bone in the body.

🎯 Exam Tip: The hyoid bone's unique characteristic makes it a common question topic; remember its location and function related to the tongue and larynx.

 

Question 29. List the three main parts of the axial skeleton.
Answer: The three main parts of the axial skeleton are:
1. Cranium (skull)
2. Hyoid (a bone in the neck)
3. Vertebral column (spine)
4. Thoracic cavity (rib cage and sternum)
In simple words: The axial skeleton includes the head (cranium), the hyoid bone in the throat, the spine (vertebral column), and the chest area (thoracic cavity). These parts form the central support of the body.

🎯 Exam Tip: Clearly differentiate between the axial and appendicular skeletons by listing their key components. Note that the original question asks for *three* parts, but the provided answer lists four, so include all provided parts for completeness.

 

Question 30. How is tetany caused?
Answer: Tetany is caused by a lack of parathyroid hormone. When this hormone is deficient, calcium levels in the blood drop too low, leading to rapid and involuntary muscle spasms. Calcium is vital for normal nerve and muscle function.
In simple words: Tetany happens when there isn't enough parathyroid hormone, causing blood calcium levels to fall. This low calcium makes muscles spasm quickly and uncontrollably.

🎯 Exam Tip: Remember that tetany is primarily linked to calcium deficiency, often due to parathyroid hormone issues, causing muscle over-excitability.

 

Question 31. How does rigor mortis happen?
Answer: After a person dies, the membranes of muscle cells become more permeable to calcium ions. This causes skeletal muscles to partially contract, but without ATP (energy), they cannot relax. This sustained muscle contraction, where muscles become stiff, is known as rigor mortis.
In simple words: Rigor mortis is when muscles become stiff after death. This happens because calcium leaks into muscle cells, causing them to contract, but with no energy (ATP) left, they can't relax.

🎯 Exam Tip: Key elements for explaining rigor mortis are calcium leakage into muscle cells and the absence of ATP for muscle relaxation.

 

Question 32. What are the different types of rib bones that form the rib cage?
Answer: The rib cage is formed by three types of rib bones:

• True ribs (the first 7 pairs) – these attach directly to the sternum.
• False ribs (pairs 8, 9, and 10) – these connect to the sternum indirectly via the cartilage of the 7th rib.
• Floating rib bones (pairs 11 and 12) – these do not attach to the sternum at all.

In simple words: The rib cage has three kinds of ribs: true ribs (which connect directly to the breastbone), false ribs (which connect indirectly), and floating ribs (which do not connect to the breastbone at all).

🎯 Exam Tip: Categorize ribs by their attachment to the sternum (direct, indirect, or none) to differentiate between true, false, and floating ribs.

 

Question 33. What are the bones that make the pelvic girdle?
Answer: The pelvic girdle is made up of three fused bones:

• Ilium
• Ischium
• Pubis

These three bones together form a single hip bone on each side, which then join to form the pelvic girdle. These bones provide support for the body's weight and attachment for leg muscles.
In simple words: The pelvic girdle is formed by three bones joined together: the ilium, ischium, and pubis. They create the hip structure that supports the body.

🎯 Exam Tip: Remember the three distinct bones that fuse to form the coxal (hip) bone of the pelvic girdle.

 

Question 34. List the disorders of the muscular system.
Answer: Common disorders of the muscular system include:

• Muscle fatigue (muscles getting tired easily)
• Atrophy (muscles wasting away or shrinking)
• Muscle pull (a tear or strain in the muscle)
• Muscular dystrophy (a group of diseases that cause progressive weakness and loss of muscle mass)
• Arthritis (inflammation of joints), including Osteoarthritis (wear-and-tear arthritis) and Rheumatoid arthritis (an autoimmune form).
• Gout (a type of arthritis caused by uric acid crystal buildup)

In simple words: The muscular system can suffer from problems like tired muscles (fatigue), shrinking muscles (atrophy), muscle tears, diseases that weaken muscles over time (muscular dystrophy), and joint inflammation (arthritis, like osteoarthritis or gout).

🎯 Exam Tip: When asked to list disorders, aim for a comprehensive list and consider grouping related conditions (like different types of arthritis).

 

Question 35. Explain the sliding-filament theory of muscle contraction.
Answer: The sliding-filament theory explains how muscles contract. It was proposed by Andrew F. Huxley and Rolf Niedergerke in 1954 and is an active process that requires energy.
The process involves several steps:

• A nerve impulse starts muscle contraction by releasing acetylcholine at the neuromuscular junction.
• This impulse causes calcium to be released from the sarcoplasmic reticulum inside the muscle cell.
• These released calcium ions attach to troponin on the thin filaments, which moves tropomyosin.
• This movement uncovers active sites on the actin (thin) filaments, allowing myosin heads to bind. This binding forms a "cross-bridge."
• The myosin head then uses energy from ATP hydrolysis (breaking down ATP into ADP and Pi) to change its angle, pulling the actin filament towards the center of the sarcomere. This is called the "power stroke." The myosin head, which contains the ATPase enzyme, helps break down ATP.
• After the power stroke, a new ATP molecule binds to the myosin head, causing it to detach from the actin.
• The myosin head then returns to its original position ("cocked" position) to prepare for another cycle, as long as calcium and ATP are available.
• This process repeats many times, making the thin filaments slide past the thick filaments, which shortens the entire sarcomere.
• The Z-discs, attached to the actin filaments, are pulled inwards from both sides, further shortening the sarcomere and thus the muscle.
• When nerve impulses stop, calcium ions are pumped back into the sarcoplasmic reticulum. This covers the active sites on actin again, preventing myosin from binding and allowing the muscle to relax. The lengths of the thick and thin filaments themselves do not change during contraction, only their overlap increases.

In simple words: Muscle contraction happens when thin actin filaments slide over thick myosin filaments. First, calcium is released and uncovers spots on actin. Then, myosin heads grab onto these spots, pull the actin, and let go using energy from ATP. This process repeats, making the muscle shorter. When the signal stops, calcium goes away, and the muscle relaxes.

🎯 Exam Tip: When explaining complex processes like the sliding-filament theory, use clear, sequential steps and emphasize the roles of calcium, ATP, actin, and myosin.

 

Question 36. What are the Benefits of regular exercise?
Answer: Regular exercise offers many benefits:
1. The muscles used in exercise become larger and stronger.
2. The resting heart rate goes down, making the heart more efficient.
3. More enzymes are produced in the muscle fibers, which helps with energy use.
4. Ligaments and tendons become stronger, improving joint stability.
5. Joints become more flexible, increasing range of motion.
6. It provides protection from heart attacks and other heart diseases.
7. It positively influences hormonal activity in the body.
8. It improves cognitive functions, such as thinking and memory.
9. It helps prevent obesity by burning calories and boosting metabolism.
10. It promotes confidence and self-esteem.
11. It leads to a better physique and aesthetic appearance.
12. It improves overall well-being and quality of life.
13. It helps prevent depression, stress, and anxiety, promoting mental health. Regular physical activity is a cornerstone of a healthy lifestyle, impacting both physical and mental well-being.
In simple words: Regular exercise makes your muscles and heart stronger, improves flexibility, helps prevent diseases like obesity and heart attacks, and boosts your mood and thinking. It helps you stay healthy and feel good overall.

🎯 Exam Tip: For benefits, categorize your points (e.g., physical, mental, physiological) to ensure a comprehensive answer.

Part II.

11th Bio Zoology Guide Locomotion and Movement Additional Important Questions and Answers

I. Choose The Best Options

 

Question 1. The pseudopodia of amoeba is formed from
(a) Cytoplasm
(b) Nucleoplasm
(c) Sarcoplasm
(d) all the above
Answer: (a) Cytoplasm
In simple words: Pseudopodia, which are like fake feet, are formed when an amoeba pushes out parts of its cytoplasm to move or eat.

🎯 Exam Tip: Remember that cytoplasm is the main fluid content of a cell, and its flow (cytoplasmic streaming) is key to amoeboid movement.

 

Question 2. Muscles are formed by
(a) myocytes
(b) leucocytes
(c) osteocytes
(d) lymphocytes
Answer: (a) myocytes
In simple words: Muscles are primarily made up of cells called myocytes, which are muscle cells. These cells help in muscle contraction and movement.

🎯 Exam Tip: Remember that "myo-" prefix often refers to muscle, helping to identify related terms quickly in biology.

 

Question 3. The muscles attached to the bone are called
(a) skeletal muscle
(b) cardiac muscle
(c) involuntary muscle
(d) smooth muscles
Answer: (a) skeletal muscle
In simple words: Skeletal muscles are the muscles that connect to your bones and help you move. They are different from heart muscle (cardiac) or internal organ muscles (smooth/involuntary).

🎯 Exam Tip: Distinguish between the three main types of muscle tissue: skeletal (voluntary, attached to bones), cardiac (involuntary, heart), and smooth (involuntary, internal organs).

 

Question 4. Skeletal muscles are attached to the bones by
(a) tendon
(b) ligament
(c) pectin
(d) fibrin
Answer: (a) tendon
In simple words: Strong, flexible cords called tendons connect muscles to bones, allowing them to pull on the bones and create movement. Ligaments, on the other hand, connect bones to other bones.

🎯 Exam Tip: Clearly differentiate between tendons (muscle to bone) and ligaments (bone to bone) as this is a common point of confusion.

 

Question 5. The bundle of muscle fibres is called
(a) Myofibrils
(b) fascicle
(c) sarcomere
(d) sarcoplasm
Answer: (b) fascicle
In simple words: A fascicle is a small bundle of muscle fibers. These bundles work together to form a whole muscle.

🎯 Exam Tip: Understand the hierarchical organization of a muscle: muscle > fascicle > muscle fiber > myofibril > sarcomere.

 

Question 6. Name the connective tissue which covers the entire muscle?
(a) Epimycium
(b) Perimycium
(c) Endomyciurn
(d) Mesornyscium
Answer: (a) Epimycium
In simple words: The epimysium is a tough outer layer of connective tissue that surrounds and protects the whole muscle.

🎯 Exam Tip: Memorize the three main connective tissue coverings: epimysium (whole muscle), perimysium (fascicle), and endomysium (individual muscle fiber).

 

Question 7. Name the membrane which covers each fasiculi
(a) Epimycium
(b) Perirnycium
(c) Endomyciurn
(d) Mesomvscium
Answer: (b) Perirnycium
In simple words: Each bundle of muscle fibers, called a fascicle, is wrapped in a layer of connective tissue called perimysium. This helps organize the muscle.

🎯 Exam Tip: Remember the order of muscle coverings: epimysium covers the entire muscle, perimysium covers fascicles, and endomysium covers individual muscle fibers.

 

Question 8. Name the membrane which covers each muscle fibre?
(a) Epimycium
(b) Perimycium
(c) Endomycium
(d) Mesomysciurn
Answer: (c) Endomycium
In simple words: The endomysium is a delicate layer of connective tissue that wraps around each single muscle cell or fiber. This provides support and protection to individual fibers.

🎯 Exam Tip: Visualizing the muscle structure helps: a large muscle (epimysium) is made of bundles (perimysium), and each bundle has many fibers (endomysium).

 

Question 9. Match and Find the Correct Pair
1. Sarcoplasm – a) Respiratory pigment
2. Myoglobin – b) Glucose giver
3. Glycosome – c) Unit of skeletal muscle
4. Sarcomere – d) cytoplasm
(a) I- d, II – a, III – b,IV- c
(b) I- d, II – b, III – c, IV- a
(c) I- c, II – a, III – b,IV- d
(d) I- d, II – c, III – a,IV- b
Answer: (a) I- d, II – a, III – b,IV- c
In simple words: Sarcoplasm is the cytoplasm of muscle cells. Myoglobin is a red pigment that stores oxygen in muscles. Glycosomes store glycogen to provide glucose. A sarcomere is the basic unit of muscle contraction.

🎯 Exam Tip: For matching questions, break down each term and its function. "Sarc-" refers to muscle, and "-plasm" refers to cytoplasm.

 

Question 10. Find the correct and wrong statement and arrange the following statement.
1. The contraction of muscle fibres depends on the actin and myosin protein.
2. The thick muscle fibres depends on Myosin.
3. Each meromyosin molecule will have a globular head with a long arm.
4. The head of the meromyosin bears an actin-binding site and an ATP binding site.
(a) True True False True
(b) True True True True
(c) True False False False
(d) False False True True
Answer: (a) True True False True
In simple words: Muscle contraction needs actin and myosin. Thick muscle filaments use myosin. Meromyosin has a globular head and a long arm. The meromyosin head has spots for actin and ATP to attach.

🎯 Exam Tip: Focus on the specific roles of actin and myosin filaments in muscle contraction and their structural components.

 

Question 11. Name the protein that regulates muscle contraction
(a) Tropomyosin and actin
(b) Troponin and myosin
(c) tropomyosin and troponin
(d) None of the options
Answer: (c) tropomyosin and troponin
In simple words: Tropomyosin and troponin are two important proteins that control when and how muscles contract by regulating the interaction between actin and myosin.

🎯 Exam Tip: Remember that troponin and tropomyosin act like a "switch" that turns muscle contraction on or off by controlling actin's availability to myosin.

 

Question 12. Who has proposed sliding – filaments hypothesis?
(a) Andrew F. Huxley and Rolf Nieder gerke
(b) Andrew F. Huxley and Nelson
(c) Andrew F. Pluxley and Darwin
(d) Andrew F. Huxley and Mendal
Answer: (a) Andrew F. Huxley and Rolf Nieder gerke
In simple words: The idea of how muscles contract by filaments sliding past each other was first suggested by Andrew F. Huxley and Rolf Niedergerke. This is known as the sliding filament theory.

🎯 Exam Tip: Know the key scientists associated with important theories, especially foundational concepts like the sliding filament theory.

 

Question 13. Which chemical initiates the opening of multiple gated channels in sarcolemma?
(a) Epinephrine
(b) Norepinephrine
(c) acetylcholine
(d) erythromycin
Answer: (c) acetylcholine
In simple words: Acetylcholine is a special chemical messenger that tells muscle cells to start working by opening channels on their surface (sarcolemma). This signal helps muscles contract.

🎯 Exam Tip: Acetylcholine is a crucial neurotransmitter in the neuromuscular junction, responsible for muscle activation. Medications affecting it can impact muscle function.

 

Question 14. Find out the wrong pair
(a) Fast – oxidative fibres – have high ATP ase activity
(b) Slow – oxidative fibres – low rates of ATP ase activity
(c) Oxidative fibres – less number of mitochondria
(d) Red muscle fibres – oxidative fibres
Answer: (c) Oxidative fibres – less number of mitochondria
In simple words: Oxidative muscle fibers are known for having many mitochondria, not less. Mitochondria are the powerhouses of the cell, making energy using oxygen.

🎯 Exam Tip: Oxidative fibers are efficient at using oxygen and are rich in mitochondria, while glycolytic fibers have fewer mitochondria and rely more on glycolysis.

 

Question 15. The skeletal system is formed from this layer!
(a) Ectoderm
(b) Mesoderm
(c) Endoderm
(d) Neuroderm
Answer: (b) Mesoderm
In simple words: The skeletal system, which includes bones and cartilage, develops from the mesoderm, one of the three main layers of cells in an early embryo.

🎯 Exam Tip: Relate the germ layers (ectoderm, mesoderm, endoderm) to the organs and systems they develop into to understand developmental biology better.

 

Question 16. a number of bones forms the endoskeleton of man?
(a) 210
(b) 220
(c) 206
(d) 209
Answer: (c) 206
In simple words: An adult human skeleton is made up of 206 bones. This number can be different in babies because some bones fuse together as we grow.

🎯 Exam Tip: Remember the standard number of bones in an adult human skeleton is 206.

 

Question 17. How many bones are there in the axial and appendicular skeleton?
(a) 80 and 126
(b) 126 and 80
(c) 80 and 120
(d) 80 and 118
Answer: (a) 80 and 126
In simple words: The axial skeleton, which is the core of the body, has 80 bones, while the appendicular skeleton, which includes the limbs and their attachments, has 126 bones. Together, these make up the total of 206 bones.

🎯 Exam Tip: Differentiate between the axial skeleton (skull, vertebral column, rib cage) and the appendicular skeleton (limbs and girdles) and know the bone count for each.

 

Question 18. How many bones are there in the facial and cranial bones?
(a) 14 and 9
(b) 14 and 8
(c) 14 and 10
(d) 14 and 12
Answer: (b) 14 and 8
In simple words: The human skull is made up of 14 facial bones that form the face, and 8 cranial bones that protect the brain. This makes a total of 22 bones in the skull.

🎯 Exam Tip: Remember the breakdown of skull bones into facial and cranial components, as well as the total count.

 

Question 19. Name the opening of the temporal bone
(a) External auditory meatus
(b) Nasal opening
(c) Optic opening
(d) Mouth
Answer: (a) External auditory meatus
In simple words: The external auditory meatus is the opening in the temporal bone that leads to the eardrum. It is the outer part of the ear canal.

🎯 Exam Tip: Connect bone structures to their functions; the external auditory meatus is key for hearing as it channels sound waves.

 

Question 20. Name the U-shaped single bone present at the base of the buccal cavity.
(a) Palantine bone
(b) Hyoid bone
(c) Ethmoid bone
(d) Sphenoid bone
Answer: (b) Hyoid bone
In simple words: The hyoid bone is a unique U-shaped bone in the neck that floats below the tongue and helps with swallowing and speaking. It is the only bone in the body not directly connected to another bone.

🎯 Exam Tip: The hyoid bone's unique characteristic of not articulating with any other bone makes it a distinct and important part of the neck anatomy.

 

Question 21. How many bones are there in the vertebral column?
(a) 33
(b) 32
(c) 30
(d) 36
Answer: (a) 33
In simple words: The vertebral column, or backbone, is made of 33 bones called vertebrae in children. In adults, some of these fuse, reducing the number of individual bones.

🎯 Exam Tip: Note that the number of vertebrae can be counted as 33 in a child (before fusion of sacrum and coccyx) or 26 in an adult (after fusion).

 

Question 22. Match and find the correct pair
1) Cervical vertebrae – a) – 5
2) Thoraic – b)-I
3) Pelvic bone – 0-7
4) Cocyx bone – d) -12
(a) I -c, II – d, III – a,IV – b
(b) I -c, II – a, III – d, IV – b
(c) I -c, II – a, III – b,IV- d
(d) I -a, II – d, III – c,IV – b
Answer: (a) I -c, II – d, III – a,IV – b
In simple words: This option correctly matches Cervical vertebrae to their respective count, Thoracic vertebrae, Pelvic bone count, and Coccyx bone count.

🎯 Exam Tip: Accurately identifying the number of vertebrae in each region (cervical, thoracic, lumbar, sacral, coccygeal) is crucial for skeletal system questions.

 

Question 23. In which bone situated?
(a) Cervical vertebra
(b) thoracic vertebra
(c) Pelvic vertebra
(d) all the options
Answer: (d) all the options
In simple words: This question is asking about bones that are situated in the body. All the options listed (cervical, thoracic, and pelvic vertebrae) are types of bones found in the human body.

🎯 Exam Tip: Understand that cervical, thoracic, and pelvic vertebrae are all distinct regions of the vertebral column, each with specific locations and functions.

 

Question 24. Name the first vertebra?
(a) Atlas
(b) Maleus
(c) Incus
(d) Stapes
Answer: (a) Atlas
In simple words: The first bone in your neck, right under your skull, is called the Atlas. It helps support your head and allows you to nod.

🎯 Exam Tip: Remember the names of the first two cervical vertebrae, Atlas (C1) and Axis (C2), and their distinct roles in head movement.

 

Question 25. Name the second vertebra?
(a) Atlas
(b) Axis
(c) Maleus
(d) Stapes
Answer: (b) Axis
In simple words: The second bone in your neck, below the Atlas, is called the Axis. It has a special peg-like structure that the Atlas rotates around, allowing you to turn your head from side to side.

🎯 Exam Tip: The pivot joint between the atlas and axis is crucial for head rotation; the dens of the axis is the key anatomical feature.

 

Question 26. How many are the number of ribs?
(a) 14 pair
(b) 13 pair
(c) 12 pair
(d) 15 pair
Answer: (c) 12 pair
In simple words: Humans normally have 12 pairs of ribs, making a total of 24 ribs. These ribs form the rib cage and protect your internal organs.

🎯 Exam Tip: Distinguish between true, false, and floating ribs within the 12 pairs to show a deeper understanding of the rib cage structure.

 

Question 27. Match and find the correct answer
1) ribs – a) – 1, 7
2) True ribs – b) -11,12
3) False ribs – c) – Bicephalic
4) Floating ribs – d) – 8,10
(a) c d a b
(b) c a d b
(c) c b d d
(d) a d C b
Answer: (b) I – c, II – a, III – d,IV -b
In simple words: The correct matching aligns "ribs" with "Bicephalic", "True ribs" with "1, 7 pairs", "False ribs" with "8,10th pairs", and "Floating ribs" with "11,12th pair".

🎯 Exam Tip: Knowing the characteristics and classifications of ribs (true, false, floating) is essential for matching questions on the skeletal system.

 

Question 28. How many bones are there appendicular skeleton?
(a) 130
(b) 140
(c) 126
(d) 122
Answer: (c) 126
In simple words: The appendicular skeleton, which includes the bones of the arms, legs, shoulders, and hips, consists of 126 bones. This allows for a wide range of movement.

🎯 Exam Tip: Remember that the appendicular skeleton is designed for movement and includes the limbs and their supporting girdles.

 

Question 29. Which forms the appendicular skeleton?
(a) Upper and hindlimbs
(b) Upper limbs and thoracic bones
(c) Hind and vertebral column
(d) Hind and cranial bones
Answer: (a) Upper and hindlimbs
In simple words: The appendicular skeleton is made up of the bones in your arms and legs (upper and hindlimbs), along with the shoulder and hip bones that connect them to the main body.

🎯 Exam Tip: The appendicular skeleton refers to the parts that "append" or attach to the main body axis, primarily the limbs and their girdles.

 

Question 30. Name the bones which joint the axial and appendicular skeleton.
(a) Clavicle bone
(b) Scapula
(c) Acromian process
(d) None of the options
Answer: (a) Clavicle bone
In simple words: The clavicle, also known as the collarbone, is one of the bones that connects the appendicular skeleton (like your arm) to the axial skeleton (like your sternum).

🎯 Exam Tip: The clavicle and scapula (shoulder blade) form the pectoral girdle, which attaches the upper limb to the axial skeleton.

 

Question 31. How many bones are there in the upper arm.
(a) 30
(b) 32
(c) 34
(d) 36
Answer: (a) 30
In simple words: Each upper limb, from the shoulder to the fingertips, contains a total of 30 bones. This includes the humerus, radius, ulna, carpals, metacarpals, and phalanges.

🎯 Exam Tip: Know the specific bones in each part of the upper limb (arm, forearm, wrist, hand) and their respective counts to sum up to 30.

 

Question 32. Find the wrong pair.
(a) Wrist bone – 8
(b) Fore arm bones – 30
(c) Facial bone -16
(d) Cranial bones – 8
Answer: (c) Facial bone -16
In simple words: There are 14 facial bones, not 16. The pair "Facial bone -16" is incorrect.

🎯 Exam Tip: Double-check numerical counts for bones in different body regions, as these are common areas for 'wrong pair' questions.

 

Question 33. Find the wrong pair
(a) Palm bones – 5
(b) Phalanges -14
(c) Thoracic bone – 12
(d) Vertebral column – 33
Answer: (d) Vertebral column – 33
In simple words: While a child's vertebral column has 33 bones, an adult's typically has 26 due to fusion. So, stating 33 for the adult vertebral column might be considered a wrong pair in some contexts.

🎯 Exam Tip: Be precise about bone counts, especially when they differ between children and adults, like in the vertebral column.

 

Question 34. Match and find the correct pair.
1) Cervical vertebra – a) – 12
2) Thoracic vertebra – b) – 1
3) Pelvic vertebra – c) – 7
4) Coccyx – d)-5
(a) I- c, II – a, III – d, IV – b
(b) I- a, II – b, III – c, IV – d
(c) I- a, II – c, III – d, IV – b
(d) I- c, II – a, III – b, IV – d
Answer: (a) I- c, II – a, III – d, IV – b
In simple words: This option correctly matches the given vertebral regions to their corresponding numbers as provided by the question.

🎯 Exam Tip: In matching questions involving numbers, ensure you understand if the numbers refer to actual counts, labels, or a sequence, and match accordingly.

 

Question 35. The oxidative skeletal muscle fibres are termed as
(a) Fatty muscle fibres
(b) White muscle fibres
(c) red muscle fibres
(d) yellow muscle
Answer: (c) red muscle fibres
In simple words: Oxidative skeletal muscle fibers are also called red muscle fibers because they contain a lot of myoglobin, which is a red pigment that stores oxygen. This helps them work for a long time.

🎯 Exam Tip: Relate the color of muscle fibers (red or white) to their metabolic characteristics and function (endurance or power).

 

Question 36. Whether the following statement is correct or wrong find out the correct sequence.
1) Pelvic bone Ilium, Ischium, and pubis
2) Acetabulam cavity is present in the sacrum
3) The head of the thigh bone fits in the acetabulum cavity
4) The pubic bones articulate anteriorly at the pubic symphysis
(a) 1 - True, 2 – False, 3 – True, 4 – True
(b) 1 – False, 2 – False, 3 – True, 4 – True
(c) 1 – False, 2 – True, 3 – True, 4 – True
(d) 1 – True, 2 – True, 3 – False, 4 – True
Answer: (a) 1 - True, 2 – False, 3 – True, 4 – True
In simple words: The pelvic bone is indeed made of ilium, ischium, and pubis (True). The acetabulum is in the hip bone, not the sacrum (False). The thigh bone fits into the acetabulum (True). The pubic bones connect at the pubic symphysis (True).

🎯 Exam Tip: Understand the anatomy of the pelvic girdle and hip joint, including the components of the coxal bone and the location of the acetabulum.

 

Question 37. Which is the prominent bone of the pelvic bone?
(a) Ilium
(b) Ischium
(c) Pubis
(d) all the options
Answer: (a) Ilium
In simple words: The ilium is the largest and most recognizable part of the hip bone, forming the upper, flared section of the pelvis. It is a key bone in the pelvic girdle.

🎯 Exam Tip: The ilium forms the superior and largest part of the hip bone, often felt when you place your hands on your hips.

 

Question 38. What is the number of hind limbs?
(a) 32
(b) 37
(c) 30
(d) 34
Answer: (c) 30
In simple words: Similar to the upper limbs, each lower limb (hind limb) also contains 30 bones, including the femur, tibia, fibula, tarsals, metatarsals, and phalanges.

🎯 Exam Tip: Be consistent with bone counts for both upper and lower limbs; both typically have 30 bones each.

 

Question 39. Name the longest bone
(a) Femur
(b) Humerus bone
(c) Tibia
(d) all the options
Answer: (a) Femur
In simple words: The femur, also known as the thigh bone, is the longest and strongest bone in the human body. It runs from the hip to the knee.

🎯 Exam Tip: Knowing the general characteristics of major bones, such as size and strength, helps identify them quickly.

 

Question 40. Match and find the correct pair.
1)Patella – a)-14
2) Tarsus – b) -5
3) Metatarsus – c) – 7 bones
4) Phalanges – d) - kneecap
Answer: (3) Metatarsus – c) – 7 bones
In simple words: In this question, the third pair, Metatarsus matched with 'c' and '7 bones', is identified as the correct answer.

🎯 Exam Tip: For matching questions where pairs are pre-listed, carefully evaluate each pair to determine which one is considered correct by the source.

 

Question 41. Name the membrane which covers the femur bone.
(a) Periosteum
(b) Endosteum
(c) Osteoclast
(d) Osteoblast
Answer: (a) Periosteum
In simple words: The periosteum is a tough outer membrane that covers the surface of bones, including the femur. It protects the bone and helps in its growth and repair.

🎯 Exam Tip: Differentiate between periosteum (outer bone covering) and endosteum (inner bone cavity lining). Osteoclasts and osteoblasts are bone cells, not membranes.

 

Question 42. Name the joints seen in the cranial region
(a) Fibrous joints
(b) Cartilagenous joints
(c) Diarthroses joints
(d) Synovial joints
Answer: (a) Fibrous joints
In simple words: The joints in the skull bones are called fibrous joints. They do not allow any movement, acting like strong glue to hold the skull together.

🎯 Exam Tip: Remember that fibrous joints, like those in the skull, are fixed and allow no movement, which is important for protecting organs like the brain.

 

Question 43. The Synovial fluid is seen in joints.
(a) Cartilagenous joints
(b) Diarthroses joints
(c) Fibrous joints
(d) All of the options
Answer: (b) Diarthroses joints
In simple words: Synovial fluid is found in diarthroses joints, which are also known as freely movable joints. This fluid helps the joints move smoothly.

🎯 Exam Tip: Synovial fluid acts as a lubricant, reducing friction and allowing a wide range of motion in joints like the knee or shoulder.

 

Question 44. Name the diseases due to the deficiency of acetylcholine.
(a) Myasthenia gravis
(b) Tetany
(c) Duchene muscular dystrophy
(d) Muscle pull
Answer: (a) Myasthenia gravis
In simple words: When there is not enough acetylcholine, a chemical that helps muscles work, a disease called Myasthenia gravis can happen. This makes muscles weak and tired.

🎯 Exam Tip: Myasthenia gravis specifically affects the communication between nerves and muscles, leading to muscle weakness, often worsening with activity.

 

Question 45. Name the disease due to the deficiency of ATP
(a) Muscle fatigue
(b) Muscle pull
(c) Muscular dystrophy
(d) Tetany
Answer: (a) Muscle fatigue
In simple words: Muscle fatigue happens when muscles get tired from not having enough ATP, which is the energy needed for them to work.

🎯 Exam Tip: ATP is the direct energy source for muscle contraction; a lack of it impairs the muscle's ability to contract effectively, causing fatigue.

 

Question 46. A tear in the muscle
(a) Muscle fatigue
(b) Muscle pull
(c) Atrophy
(d) Muscular dystrophy
Answer: (b) Muscle Pull
In simple words: A muscle pull is when the muscle fibers tear, often due to too much force or sudden movement.

🎯 Exam Tip: Muscle pull, also known as a muscle strain, occurs when muscle fibers are stretched or torn, often leading to pain and limited movement.

 

Question 47. Name the arthritis due to aging.
(a) Osteoarthritis
(b) Rheumatoid arthritis
(c) Gout
(d) Osteoporosis
Answer: (a) Osteoarthritis
In simple words: Osteoarthritis is a type of arthritis that happens as people get older, causing wear and tear on the joints.

🎯 Exam Tip: Osteoarthritis is primarily a degenerative joint disease where the cartilage cushioning the ends of bones wears down over time, common with aging.

 

Question 48. Osteoporosis is due to
(a) Calcium
(b) Sodium
(c) Magnesium
(d) Potassium
Answer: (a) Calcium
In simple words: Osteoporosis happens when there isn't enough calcium, making bones weak and easy to break. Calcium is essential for strong bones.

🎯 Exam Tip: A diet rich in calcium and vitamin D, along with weight-bearing exercises, is crucial for preventing osteoporosis and maintaining bone density.

 

Question 49. The deposition of urate crystals on the joints is called as
(a) Gout
(b) Rheumatoid
(c) arthritis
(d) Osteoporosis
Answer: (a) Gout
In simple words: When urate crystals build up in the joints, it causes a painful condition called gout. This often affects the big toe.

🎯 Exam Tip: Gout is a form of inflammatory arthritis characterized by sudden, severe attacks of pain, redness, and tenderness in joints, caused by high levels of uric acid in the blood.

 

Question 50. Assertion A: Acetylcholine is secreted in the Neuromuscular junction. Reason B: If acetylcholine is not secreted there won't be any multiple gated channels in the sarcolemma.
(a) A true B wrong
(b) A true B this explains the action of A
(c) A wrong B true
(d) A wrong B wrong
Answer: (b) A true B this explains the action of A
In simple words: Assertion A is true because acetylcholine is indeed released at the neuromuscular junction. Reason B correctly explains that without acetylcholine, the necessary channels in the muscle's outer membrane would not open, preventing muscle contraction.

🎯 Exam Tip: Acetylcholine acts as a neurotransmitter, binding to receptors on the sarcolemma and initiating the electrical signal that leads to muscle contraction.

 

Question 51. Assertion A: The upper limbs are attached to the pectoral girdles. Reason B: The pectoral girdles are very light and allow the mobility of the hand
(a) A wrong B wrong
(b) A True B does not explains the A
(c) A True B explains the functions of A
(d) A True B wrong
Answer: (c) A True B explains the functions of A
In simple words: Assertion A is true because our arms connect to the body through the pectoral girdles. Reason B is also true and explains why, stating that these girdles are light and allow for much arm movement, which is their main job.

🎯 Exam Tip: The pectoral girdle's design prioritizes flexibility and range of motion for the upper limbs, contrasting with the pelvic girdle which is built for stability and weight-bearing.

 

Question 52. Assertion A: In the pelvis bone a deep socket is present called acetabulum. Reason B: The head of the femur bone fits in the acetabulum.
(a) A True B explains the functions of A
(b) A wrong B explains the functions of A
(c) A True B wrong
(d) B does not explains the structure of B
Answer: (a) A True B explains the functions of A
In simple words: Assertion A is true because the pelvis has a deep part called the acetabulum. Reason B is also true and explains that the top part of the thigh bone (femur) fits into this acetabulum, allowing for hip movement.

🎯 Exam Tip: The acetabulum forms a strong ball-and-socket joint with the femur, enabling a wide range of motion in the hip while also providing significant stability for weight support.

 

Question 53. Assertion A: The pelvis of female is shallow wide and flexible in nature Cause B: This helps during pregnancy.
(a) A True B explains the functions of A
(b) A wrong B explains the functions of A
(c) A True B wrong
(d) B does not explains the structure of A
Answer: (a) A True B explains the functions of A
In simple words: Assertion A is true; a female's pelvis is generally wider and more flexible. Reason B is also true and explains that this shape helps during pregnancy and childbirth.

🎯 Exam Tip: The structural differences in the male and female pelvis are significant, with the female pelvis adapted to facilitate childbirth, being broader and shallower.

 

Question 54. Assertion A: The lower arm carries the entire weight of the body and is subjected to exceptional forces when we jump or run. Reason B: To bear the weight of the body it has 46 bones
(a) A True B True
(b) A wrong B wrong
(c) A True B does not explains the functions of A
(d) A True B Wrong
Answer: (c) A True B does not explains the functions of A
In simple words: Assertion A is true because the lower arm (forearm) handles a lot of force during activities like jumping or running. Reason B is also true because the forearm does have many bones for strength. However, the number of bones doesn't directly explain *why* it bears the body's weight, as other parts of the body, like legs, are primarily responsible for bearing the full body weight.

🎯 Exam Tip: While the forearm bones are crucial for movements and bearing some loads, the primary weight-bearing function for the entire body during locomotion falls on the lower limbs and their structures.

 

Question 55. Assertion A: The cranium belongs to immovable fixed joints. Reason B: Structures of the flat skull bones are fibrous joints
(a) A True B Wrong
(b) A True B explains the structure of A
(c) A True B True
(d) B does not explains the structure of A
Answer: (b) A True B explains the structure of A
In simple words: Assertion A is true because the bones in the cranium (skull) are fixed and do not move. Reason B is also true and explains Assertion A: the flat skull bones are connected by strong fibrous joints (sutures), which stop movement to protect the brain.

🎯 Exam Tip: The immovable nature of cranial fibrous joints provides a rigid protective casing for the brain, highlighting their critical role in shielding vital organs.

 

Question 56. Assertion A: The decreased synthesis of acetylcholine in the neuromuscular junction, causes myasthenia gravis. Reason B: This leads to muscle fatigue weakness, paralysis.
(a) A and B are True
(b) A and B are wrong
(c) A True B wrong
(d) A wrong B True
Answer: (a) A and B are True
In simple words: Both statements are true. Assertion A is correct that less acetylcholine at muscle junctions causes myasthenia gravis. Reason B is also correct, as this lack leads to muscle tiredness, weakness, and can even cause paralysis.

🎯 Exam Tip: Understanding the role of acetylcholine in muscle contraction is key to grasping the pathology of myasthenia gravis, where impaired neurotransmission leads to characteristic muscle weakness.

 

Question 57. Match and arrange the sequence :
1. Ball and Socket bone
2. Saddle joint
3. Plane join
4. Hinge joint
I
II
III
IV
(a) D C A B
(b) A B C D
(c) A C D B
(d) B C A D
Answer: (a) I - D, II - C, III-A,IV - B
In simple words: Match each joint type with its correct representation or characteristic to find the sequence. For example, a ball and socket joint allows movement in many directions.

🎯 Exam Tip: Familiarize yourself with the characteristics and common locations of different joint types to quickly identify them in matching questions.

 

Question 58. Match and arrange the sequence:
Answer:
In simple words: This question asks to match and arrange a sequence, but the matching items or options were not provided in the original content.

🎯 Exam Tip: Always double-check that all parts of a matching question, including both columns and answer choices, are clearly presented before attempting to solve it.

II. Very Short Answers

 

Question 1. What is amoeboid movement?
Answer: Amoeboid movement is how cells move by streaming their cytoplasm to form temporary extensions called pseudopodia. Cells like macrophages use this movement to engulf harmful substances. This type of movement helps cells change shape and move through tissues.
In simple words: Amoeboid movement is when cells move by pushing out parts of their body, like false feet, to crawl along. Macrophages, which eat germs, move this way.

🎯 Exam Tip: Remember that amoeboid movement is characteristic of single-celled organisms and certain human cells, relying on the dynamic rearrangement of the cytoskeleton.

 

Question 2. What are the types of muscles?
Answer: There are three main types of muscles in the human body:

• Skeletal muscle: These muscles are attached to bones and help us move voluntarily.
• Visceral muscles: Found in the walls of internal organs, these are involuntary muscles.
• Cardiac muscles: These are special muscles found only in the heart, responsible for pumping blood.

Each type of muscle has a unique structure and function important for body activities.
In simple words: The body has three kinds of muscles: skeletal (for movement), visceral (for organs), and cardiac (for the heart).

🎯 Exam Tip: Distinguish between voluntary (skeletal) and involuntary (visceral, cardiac) muscles, and note that cardiac muscle combines features of both.

 

Question 3. Name the muscle protein?
Answer: The main muscle proteins responsible for contraction are:

• Actin: This forms the thin filaments in muscle fibers.
• Myosin: This forms the thick filaments and has heads that pull on actin.

These two proteins work together to make muscles contract and relax.
In simple words: The main proteins in muscles are actin and myosin, which work together to make muscles move.

🎯 Exam Tip: Understanding the interaction between actin and myosin is fundamental to the sliding filament theory of muscle contraction.

 

Question 4. Name the regulatory proteins in the thin filaments.
Answer: The regulatory proteins found in the thin filaments of muscle are:

• Tropomyosin: This protein covers the binding sites on actin when the muscle is relaxed.
• Troponin: This protein binds to calcium ions, moving tropomyosin away from the actin binding sites.

These proteins control when and how muscles contract by regulating actin-myosin interaction.
In simple words: Tropomyosin and troponin are proteins that control if muscles can contract by covering or uncovering spots on actin.

🎯 Exam Tip: Calcium ions play a crucial role by binding to troponin, which then initiates the unmasking of actin binding sites, allowing muscle contraction to occur.

 

Question 5. Classify the muscles on the basis of their rate of shortening?
Answer: Muscles can be classified based on how quickly they shorten (contract):

• Fast contraction fibre: These fibers contract quickly and powerfully but tire easily. They are often used for bursts of intense activity.
• Slow contraction fibre: These fibers contract slowly and are more resistant to fatigue. They are used for sustained activities like maintaining posture.

This classification helps understand how different muscles are suited for specific types of movement.
In simple words: Muscles are grouped by how fast they contract: fast fibers for quick, strong actions, and slow fibers for long, steady movements.

🎯 Exam Tip: Fast twitch fibers are typically white due to fewer mitochondria, while slow twitch fibers are red due to high myoglobin content and more mitochondria for aerobic respiration.

 

Question 6. On the basis of ATP formation, how are muscles classified?
Answer: Based on how they make ATP (energy), muscles are classified into:

• Oxidative fibres: These fibers produce ATP using oxygen (aerobic respiration) and are resistant to fatigue. They have many mitochondria and a rich blood supply.
• Glycolytic fibres: These fibers primarily produce ATP without oxygen (anaerobic glycolysis) and are suited for short, intense bursts of activity. They have fewer mitochondria.

This energy pathway determines a muscle's endurance and power.
In simple words: Muscles are split into oxidative (use oxygen for energy) and glycolytic (use sugar without oxygen for energy).

🎯 Exam Tip: Oxidative fibers are often referred to as 'red' fibers due to high myoglobin and capillary density, while glycolytic fibers are 'white' due to lower myoglobin and fewer capillaries.

 

Question 7. How are muscles classified on the basis of ATP are activity?
Answer: Based on their ATP activity, muscles are classified as:

• Fast oxidative fibres: These fibers have high ATP activity and are good for rapid, sustained contractions.
• Slow oxidative fibres: These fibers have low ATP activity and are suited for prolonged, slower contractions without tiring quickly.

This difference in ATP usage allows muscles to perform various functions, from quick movements to endurance tasks.
In simple words: Muscles are classified by their ATP activity: fast oxidative for quick, lasting actions and slow oxidative for long, steady actions.

🎯 Exam Tip: The rate of ATP hydrolysis by myosin ATPase determines the speed of muscle contraction; faster hydrolysis equals faster contraction.

 

Question 8. What is perimysium?
Answer: The perimysium is a type of connective tissue that wraps around bundles of muscle fibers called fascicles. It helps to organize the muscle and provides a pathway for blood vessels and nerves within the muscle. This connective tissue provides structural support and protection.
In simple words: Perimysium is a tissue that covers bundles of muscle fibers, keeping them together.

🎯 Exam Tip: Remember the three layers of connective tissue in a muscle: epimysium (whole muscle), perimysium (fascicles), and endomysium (individual fibers), all crucial for muscle organization and function.

 

Question 9. Differentiate the oxidative fibre from the glycolytic fibre.
Answer:

Oxidative fibers are ideal for endurance activities due to their efficient oxygen use, while glycolytic fibers are better for quick, powerful bursts of activity.
In simple words: Oxidative fibers use oxygen, have many mitochondria, and are red. Glycolytic fibers don't need much oxygen, have few mitochondria, and are white.

🎯 Exam Tip: Focus on the key differences like oxygen dependency, mitochondrial count, and presence of myoglobin, as these directly relate to their function and color.

 

Question 10. What is sarcoplasm?
Answer: Sarcoplasm is the cytoplasm found specifically within muscle fibers. It contains various components essential for muscle function, such as glycogen (for energy storage), myoglobin (for oxygen storage), and mitochondria (for ATP production). This specialized cytoplasm helps muscle cells work efficiently.
In simple words: Sarcoplasm is the special liquid gel inside muscle cells, like cytoplasm for muscles.

🎯 Exam Tip: Remember that sarcoplasm is rich in glycogen, myoglobin, and mitochondria, which are vital for meeting the high energy demands of muscle contraction.

 

Question 11. What is meant by exo skeleton?
Answer: An exoskeleton is a rigid, hard outer covering that protects the body of certain animals, like insects and crustaceans. It provides support, protects internal organs, and helps prevent water loss. For example, a cockroach has an exoskeleton that acts like external armor.
In simple words: An exoskeleton is a hard outer shell on an animal's body that protects it, like the shell of a crab or insect.

🎯 Exam Tip: Exoskeletons, while offering strong protection, must be shed and regrown during an animal's growth, a process called molting.

 

Question 12. What is endo skeleton?
Answer: An endoskeleton is an internal skeleton found inside the body of vertebrates, such as humans. It is made of bones and cartilages and provides support, protects internal organs, and allows for muscle attachment, enabling movement. Humans have an endoskeleton that supports their entire body.
In simple words: An endoskeleton is a skeleton inside the body, like human bones, that gives support.

🎯 Exam Tip: Endoskeletons grow with the organism, eliminating the need for molting, and provide a strong internal framework for large body sizes.

 

Question 13. What are the two types of endo skeletons?
Answer: The two main types of endoskeletons in vertebrates are:
1. Axial skeleton: This part forms the central axis of the body, including the skull, vertebral column (spine), and rib cage. It protects vital organs and provides central support.
2. Appendicular skeleton: This part includes the bones of the limbs (arms and legs) and the girdles (pectoral and pelvic) that attach them to the axial skeleton. It is responsible for movement and locomotion.
These two parts work together to provide complete body structure and movement.
In simple words: The two types of endoskeletons are the axial skeleton (head, spine, ribs) and the appendicular skeleton (arms, legs, and their connecting bones).

🎯 Exam Tip: Remember that the axial skeleton provides protection and support, while the appendicular skeleton is adapted for movement and locomotion.

 

Question 14. What are Glycosomes?
Answer: Glycosomes are small granules found in muscle cells that store glycogen. Glycogen is a stored form of glucose, which is the body's main energy source. During muscle activity, these glycosomes break down glycogen to provide glucose, giving the muscles the energy they need to contract. This quick energy supply is crucial for continuous muscle function.
In simple words: Glycosomes are tiny storage units in muscles that hold glycogen, which is used to give energy when muscles work.

🎯 Exam Tip: Glycosomes are especially abundant in muscle cells, reflecting their high demand for glucose during contraction, particularly during anaerobic exercise.

 

Question 15. What is a brainbox?
Answer: The brainbox, also known as the cranium, is the part of the skull that encloses and protects the brain. It is formed by several cranial bones that are tightly fused together. This hard, protective outer covering acts like a helmet, shielding the delicate brain from injury. The shape of the brainbox is designed to offer maximum protection.
In simple words: The brainbox is the bony part of the skull that protects the brain, like a hard shell.

🎯 Exam Tip: The cranial bones are connected by immovable joints called sutures, ensuring a strong and protective enclosure for the brain.

 

Question 16. Name the ear ossicles?
Answer: The three tiny bones in the middle ear, known as ear ossicles, are:

• Malleus (hammer): This bone is connected to the eardrum.
• Incus (anvil): It is located between the malleus and stapes.
• Stapes (stirrup): This is the smallest bone in the human body and transfers vibrations to the inner ear.

These ossicles work together to amplify sound vibrations and transmit them to the inner ear, allowing us to hear.
In simple words: The ear ossicles are three small bones for hearing: malleus, incus, and stapes.

🎯 Exam Tip: The ear ossicles are critical for sound transmission; their proper function is essential for normal hearing, as they mechanically amplify sound waves.

 

Question 17. Give notes on Jaw bones?
Answer: The jaw bones consist of the upper jaw (maxilla) and the lower jaw (mandible).

• The upper jaw is made of the maxilla bones, which are fused with the cranium and cannot move.
• The lower jaw is formed by the mandible, which is a movable bone connected to the cranium by muscles, allowing for chewing and speaking.
• The ability to move the lower jaw is essential for eating and communication.

In simple words: The jaw bones include the unmoving upper jaw (maxilla) and the moving lower jaw (mandible), which helps us chew and talk.

🎯 Exam Tip: The temporomandibular joint (TMJ) connects the mandible to the skull, enabling the complex movements required for chewing, speaking, and yawning.

 

Question 18. Name the openings of the skull?
Answer: The skull has several important openings:

• The orbits: These are the bony sockets that house and protect the eyeballs.
• Nasal cavity: This is the large air-filled space above and behind the nose, which filters and warms air.
• Foramen magnum: This is a large opening at the base of the skull through which the spinal cord connects to the brain.

These openings are crucial for sensory organs, air passage, and nerve connections.
In simple words: The skull has openings for the eyes (orbits), nose (nasal cavity), and a large hole at the bottom (foramen magnum) for the spinal cord.

🎯 Exam Tip: The foramen magnum is a critical opening because it is where the central nervous system transitions from brain to spinal cord.

 

Question 19. What is meant by foramen magnum?
Answer: The foramen magnum is a large, circular opening located at the posterior base of the skull, specifically in the occipital bone. It serves as the passageway for the medulla oblongata, which is part of the brainstem, to connect with the spinal cord. This opening is vital for the communication between the brain and the rest of the body. Without it, the spinal cord could not exit the skull.
In simple words: The foramen magnum is a big hole at the bottom of the skull where the brain connects to the spinal cord.

🎯 Exam Tip: Injury to the brainstem at the foramen magnum can be life-threatening due to its role in controlling essential involuntary functions like breathing and heart rate.

 

Question 20. What are oxidative fibres?
Answer: Oxidative fibers are muscle fibers that have many mitochondria and a high capacity for producing ATP (energy) through aerobic respiration, which uses oxygen. They are also called red muscle fibers because they contain a lot of myoglobin, a protein that stores oxygen and gives them a reddish color. These fibers are good for long-lasting activities like running a marathon because they are resistant to fatigue.
In simple words: Oxidative fibers are red muscle cells that use lots of oxygen to make energy, so they can work for a long time without getting tired.

🎯 Exam Tip: Oxidative fibers are known for their endurance, relying on a steady supply of oxygen and nutrients to maintain sustained contractions without quick fatigue.

 

Question 21. Name the first two bones of the vertebral column.
Answer: The first two bones of the vertebral column, located in the neck region, are:
1. Atlas: This is the first cervical vertebra (C1). It supports the head and allows for nodding movements.
2. Axis: This is the second cervical vertebra (C2). It has a unique projection called the dens, which allows the atlas and head to rotate from side to side. Together, these two bones provide the head with its wide range of motion.
In simple words: The first two bones of the spine are the Atlas (which holds the head) and the Axis (which lets the head turn).

🎯 Exam Tip: Remember that the Atlas (C1) lacks a body and spinous process, while the Axis (C2) is characterized by its dens, crucial for rotational head movements.

 

Question 22. What are the functions of the vertebral column?
Answer: The vertebral column, or spine, performs several vital functions:

• It protects the spinal cord: The vertebrae form a strong bony canal that encloses and shields the delicate spinal cord from injury.
• Supports the head: The upper part of the vertebral column holds the skull, allowing it to move.
• Serves as the point of attachment for the ribs and musculature of the back: Many muscles and the ribs connect to the spine, providing structure for the torso and enabling movement.

Overall, the spine is central to body support, protection, and movement.
In simple words: The spine protects the spinal cord, holds up the head, and gives muscles and ribs a place to attach.

🎯 Exam Tip: The intervertebral discs between vertebrae act as shock absorbers, allowing flexibility while protecting the spinal cord during movement.

 

Question 23. Give short notes on sternum?
Answer: The sternum, also known as the breastbone, is a flat, T-shaped bone located in the middle of the chest. It forms the front part of the rib cage.

• The sternum is a flat bone on the mid ventral line of the thorax: It sits centrally in the chest.
• It provides space for the attachment of the thoracic ribs and abdominal muscles: Most ribs connect to the sternum, forming a protective cage around the heart and lungs.

This bone is crucial for protecting internal organs and plays a role in breathing movements.
In simple words: The sternum is the flat bone in the middle of your chest, where ribs connect, protecting your heart and lungs.

🎯 Exam Tip: The sternum is an important landmark for chest compressions during CPR due to its central location and connection to the rib cage.

 

Question 24. What is a hydrostatic skeleton?
Answer: A hydrostatic skeleton is a type of skeletal system found in soft-bodied invertebrates, such as earthworms and jellyfish. It consists of a fluid-filled cavity (coelom) encircled by muscles. When these muscles contract, they put pressure on the fluid, causing the body to change shape and enabling movement. For example, an earthworm uses its hydrostatic skeleton to burrow through soil.
In simple words: A hydrostatic skeleton is a body supported by fluid pressure inside muscles, like in an earthworm, helping it move.

🎯 Exam Tip: This type of skeleton is effective for burrowing and squeezing through small spaces, allowing flexibility that a rigid skeleton would not.

 

Question 25. What are true ribs?
Answer: True ribs are the first seven pairs of ribs (ribs 1-7) in the human body. They are called "true" ribs because they connect directly to the sternum (breastbone) in the front via their own costal cartilages. Dorsally (at the back), they are attached to the thoracic vertebrae. This direct connection creates a strong and stable rib cage, important for protecting vital organs and facilitating breathing.
In simple words: True ribs are the first seven pairs of ribs that connect directly from the spine to the breastbone.

🎯 Exam Tip: True ribs provide the most stable part of the rib cage, offering maximum protection to the heart and lungs while allowing necessary movement for respiration.

 

Question 26. What are false ribs?
Answer: False ribs are the 8th, 9th, and 10th pairs of ribs. They are called "false" because they do not connect directly to the sternum (breastbone) with their own cartilage. Instead, their costal cartilages join the cartilage of the rib above them (the 7th rib). This indirect attachment still contributes to forming the rib cage but allows for a bit more flexibility compared to true ribs.
In simple words: False ribs are ribs 8, 9, and 10 that connect to the sternum by joining the cartilage of the rib above them, not directly.

🎯 Exam Tip: Understand that the "false" designation refers to their indirect sternal attachment, distinguishing them from true ribs which have a direct connection.

 

Question 27. What is the sternum?
Answer: The sternum is a flat, dagger-shaped bone located in the center of the chest, commonly known as the breastbone. It is positioned along the midventral line of the thorax. Its primary role is to connect with the ribs through cartilage, forming the front part of the rib cage. This structure provides a crucial attachment point for the thoracic ribs and certain abdominal muscles, while also safeguarding the heart and lungs.
In simple words: The sternum is the flat bone in the middle of the chest that connects to the ribs, protecting the internal organs.

🎯 Exam Tip: The sternum, along with the ribs and thoracic vertebrae, forms a protective cage for vital organs like the heart and lungs.

 

Question 28. What is meant by appendicular skeleton?
Answer: The appendicular skeleton consists of the bones that make up the limbs (arms and legs) and the girdles that attach these limbs to the axial skeleton. These girdles are the pectoral girdle (shoulder) and the pelvic girdle (hip). This part of the skeleton is primarily responsible for movement, locomotion, and manipulating objects. It is composed of 126 bones in total, enabling a wide range of motion and flexibility for various activities.
In simple words: The appendicular skeleton includes the bones of our arms, legs, and the bones that connect them to the body's center, allowing movement.

🎯 Exam Tip: Focus on the appendicular skeleton's role in movement and interaction with the environment, contrasting it with the axial skeleton's role in support and protection.

 

Question 29. White the 3 segments of lower limb.
Answer: The three main segments of the lower limb are:
1. The thigh: This is the upper part of the leg, extending from the hip to the knee, and contains the femur (thigh bone).
2. The leg or the shank: This segment is between the knee and the ankle, containing two bones, the tibia and fibula.
3. The foot: This is the distal part of the lower limb, made up of many small bones, including the tarsals, metatarsals, and phalanges. These segments work together to support body weight, allow walking, and perform various movements.
In simple words: The three parts of the lower limb are the thigh, the leg (or shank), and the foot.

🎯 Exam Tip: Each segment of the lower limb has specialized bones and joints that contribute to its functions of weight-bearing, locomotion, and balance.

 

Question 30. What is meant by acromian process?
Answer: The acromion process is a prominent, flat, and expanded projection found at the lateral end of the spine of the scapula (shoulder blade). It forms the highest point of the shoulder. This process serves as an important attachment site for various muscles, including parts of the deltoid and trapezius, which are crucial for shoulder movement and arm elevation. It also articulates with the clavicle (collarbone).
In simple words: The acromion process is a bony part on the shoulder blade that sticks out, helping form the shoulder point and connecting to muscles and the collarbone.

🎯 Exam Tip: The acromion forms the acromioclavicular (AC) joint with the clavicle, a commonly injured joint in shoulder dislocations.

 

Question 31. What is meant by glenoid cavity?
Answer: The glenoid cavity is a depression found below the acromion. This cavity allows the humerus (upper arm bone) to connect and form the shoulder joint. It is crucial for the wide range of motion in the arm.
In simple words: The glenoid cavity is a small dip under the shoulder blade where your arm bone fits to make the shoulder joint.

🎯 Exam Tip: Remember that the glenoid cavity's shallow nature contributes to the shoulder joint's great flexibility but also its susceptibility to dislocation.

 

Question 32. What is meant by olecranon process?
Answer: The olecranon process is the pointed, bony part of your elbow. It is formed by the radius and ulna bones in the forearm. This part helps to form the hinge joint of the elbow, allowing the arm to bend and straighten.
In simple words: The olecranon process is the bony tip of your elbow that you can feel.

🎯 Exam Tip: Knowing anatomical landmarks like the olecranon process is vital for understanding joint movements and identifying potential injuries.

 

Question 33. What is meant by carpal tunnel?
Answer:
• The carpal tunnel is a narrow passage in the wrist. It is formed by eight wrist bones arranged in two rows, with a ligament creating a "roof" over them.
• The anterior (front) surface of the wrist looks like a tunnel, and this tunnel is known as the carpal tunnel. Many tendons and the median nerve pass through this tunnel, which can sometimes get compressed.
In simple words: The carpal tunnel is a small passage in your wrist where bones and a ligament create a tunnel for nerves and tendons.

🎯 Exam Tip: Remember that the carpal tunnel protects nerves and tendons but can also lead to issues like carpal tunnel syndrome if compressed.

 

Question 34. Name the bones which forms the coxal bones.
Answer: The coxal bones, also known as hip bones, are formed by three main bones that fuse together. These bones are the ilium, ischium, and pubis. These three bones form a strong structure that helps support the body's weight and provides attachment for leg muscles.
In simple words: The hip bones are made of three parts: the ilium, ischium, and pubis.

🎯 Exam Tip: Knowing the individual components of the coxal bones helps in understanding the pelvic girdle's structure and function in locomotion and weight bearing.

 

Question 35. What is meant by pubic symphysis?
Answer: The pubic symphysis is a cartilaginous joint where the two halves of the pelvic girdle meet in the front (ventrally). This joint contains fibrous cartilage and allows for slight movement, which is especially important during childbirth. This connection provides stability to the pelvis.
In simple words: The pubic symphysis is a strong joint at the front of the pelvis where the two hip bones connect.

🎯 Exam Tip: Understand that while most joints are designed for movement, some, like the pubic symphysis, offer stability with only minimal flexibility.

 

Question 36. Where calcium ion binds with the muscle fibre? Name the molecules which binds with calcium?
Answer:
• Calcium ions bind with the muscle fibre mainly at the thin filaments. When calcium is released, it allows the muscle to contract.
• The molecules that bind with calcium in muscle fibres are troponin. Troponin is part of the regulatory proteins found on the thin filaments, and its binding with calcium initiates the muscle contraction process.
In simple words: Calcium ions bind to thin muscle fibres, specifically to a molecule called troponin, to start muscle contraction.

🎯 Exam Tip: Calcium and troponin are key players in muscle contraction; remember their interaction is essential for muscle movement.

III. Fill Up The Blanks With Suitable Options

1. Scapula – Acromian process
– Bones of upper arm

2. First 7 pair of rib bones – True ribs
11 and 12th pair of ribs –

3. Cervical vertebrae – 7
– Lumbar bones

4. Skull bones – 22
– Skull bones

5. Thick fibres – Myosin
– Thin fibres

 

6. Amoeboid movement – Macrophage cells
– Sperm cells

1. Olecronan process

2. Floating ribs

3. 5

4. 8

5. Actin

6. Flagellated movement

IV. Short Answers

 

Question 1. Give short notes on skeletal muscle and their covering membranes.
Answer:
• Each skeletal muscle is made up of many bundles of muscle fibres called fascicles. Each muscle fibre itself has rod-like structures inside it called myofibrils.
• The entire muscle is covered by a connective tissue layer known as the epimysium. This outer layer gives the muscle its overall shape.
• Each fascicle (bundle of muscle fibres) is surrounded by a connective tissue called the perimysium. This helps organize the muscle into smaller groups.
• Individual muscle fibres are enclosed by another connective tissue layer called the endomysium. This layer provides insulation and support to each fibre.
In simple words: Skeletal muscles are bundles of fibres wrapped in layers of tissue: epimysium around the whole muscle, perimysium around bundles, and endomysium around each fibre.

🎯 Exam Tip: When describing muscle coverings, clearly distinguish between epimysium (whole muscle), perimysium (fascicles), and endomysium (individual fibres).

 

Question 2. Give the structure of a skeletal muscle fibre.
Answer:
• Each skeletal muscle fibre is a long, thin, and elongated cell. Many muscle fibres have tapered ends, meaning they become narrower at one or both ends.
• Muscle fibres are covered by a cell membrane called the sarcolemma. The cytoplasm inside the muscle fibre is called the sarcoplasm. This specialized cytoplasm contains components vital for contraction.
• Inside the sarcoplasm, there are glycosomes, myoglobin, and sarcoplasmic reticulum. Myoglobin is a red-colored pigment that stores oxygen, while glycosomes are glycogen reserves providing energy.
• Muscle fibres also contain the important muscle proteins, actin and myosin, which are responsible for muscle contraction. These proteins are organized into myofibrils, giving the muscle its striated appearance.
In simple words: Skeletal muscle fibres are long cells with a sarcolemma membrane, sarcoplasm cytoplasm, and contain myoglobin, glycogen, actin, and myosin.

🎯 Exam Tip: For muscle fibre structure, highlight the sarcolemma (membrane), sarcoplasm (cytoplasm), and the key proteins actin and myosin, along with their energy-storing components.

 

Question 3. Give notes on slow oxidative fibres.
Answer:
• Slow oxidative fibres are muscle fibres that have a low rate of myosin ATPase activity. However, they are highly efficient at producing large amounts of ATP (energy). This makes them very resistant to fatigue.
• These types of fibres are commonly found in individuals who engage in long-distance activities such as swimming and running. They are also prevalent in muscles that support posture, allowing for sustained activity.
In simple words: Slow oxidative fibres make energy slowly but can do it for a long time without getting tired, common in endurance athletes.

🎯 Exam Tip: Focus on the key characteristics of slow oxidative fibres: low ATPase activity, high ATP production, and suitability for endurance activities.

 

Question 4. Give notes on fast - oxidative fibres.
Answer:
• Fast oxidative fibres have high myosin ATPase activity, meaning they can break down ATP very quickly to generate power. They can also produce large amounts of ATP, primarily through aerobic respiration.
• These fibres are well-suited for rapid and powerful actions, such as quick movements or bursts of speed. They are faster than slow oxidative fibres but have more endurance than fast glycolytic fibres. This balance allows for sustained, high-intensity efforts.
In simple words: Fast oxidative fibres can make a lot of energy quickly and are good for rapid, powerful actions.

🎯 Exam Tip: Remember that fast oxidative fibres combine speed and moderate endurance, distinguishing them from both slow and fast glycolytic fibres.

 

Question 5. Give notes on fast glycolytic fibres.
Answer:
• Fast glycolytic fibres also have high myosin ATPase activity, allowing them to produce power quickly. However, they cannot make as much ATP as oxidative fibres because they primarily rely on glycolysis, an anaerobic process, for energy.
• These fibres are best suited for very rapid and intense actions, such as short sprints or lifting heavy weights at maximum speed. They fatigue quickly because they don't produce ATP efficiently for sustained periods.
In simple words: Fast glycolytic fibres are great for quick, strong bursts of energy but get tired very fast.

🎯 Exam Tip: Distinguish fast glycolytic fibres by their speed, high fatigue rate, and reliance on glycolysis for quick energy, making them ideal for power activities.

 

Question 6. Name the facial bones.
Answer: There are 14 facial bones that form the front part of the skull and support the face. These bones are essential for facial structure, chewing, and senses.
1. Pair of maxilla
2. Pair of Zygomatic
3. Pair of Palatine
4. Pair of lacrimal
5. Pair of Nasal
6. Mandible or lower jaw
7. Vomer
In simple words: The 14 facial bones include pairs like maxilla, zygomatic, palatine, lacrimal, and nasal, plus the single mandible and vomer.

🎯 Exam Tip: When listing facial bones, remember the pairs (maxilla, zygomatic, palatine, lacrimal, nasal) and the single bones (mandible, vomer).

 

Question 7. Give notes on fibrous joints.
Answer:
• Fibrous joints are fixed, immovable joints. This means that no movement is possible between the bones that are joined together by fibrous tissue. They provide strong connections.
• A classic example of fibrous joints is the sutures found in the flat bones of the skull. These sutures firmly hold the skull bones together, protecting the brain.
In simple words: Fibrous joints are strong, unmoving connections between bones, like the sutures in your skull.

🎯 Exam Tip: Always remember that fibrous joints offer stability and protection rather than movement, and skull sutures are the prime example.

 

Question 8. Give notes on cartilaginous joints.
Answer: Cartilaginous joints are slightly movable joints where the joint surfaces are separated by cartilage. This cartilage allows for a limited amount of movement between the bones. These joints are strong and help absorb shock.
In simple words: Cartilaginous joints let bones move a little bit because they have cartilage between them.

🎯 Exam Tip: Note that cartilaginous joints provide a balance between stability and slight flexibility, different from both immovable fibrous and freely movable synovial joints.

 

Question 9. Give notes on synovial joints.
Answer: Synovial joints are freely movable joints where the articulating bones are separated by a cavity. This cavity is filled with a special fluid called synovial fluid, which lubricates the joint and allows for smooth movement. They are the most common type of joint in the body, found in places like the knees, elbows, and shoulders.
In simple words: Synovial joints are the most common type of joint, allowing lots of movement because they have a fluid-filled space between the bones.

🎯 Exam Tip: The presence of a synovial cavity and fluid is the defining characteristic of freely movable synovial joints, crucial for smooth motion.

 

Question 10. Give notes on myasthenia gravis.
Answer:
• Myasthenia gravis is an autoimmune disorder that affects the action of acetylcholine at the neuromuscular junction. This leads to muscle fatigue and weakness.
• The body's immune system mistakenly produces antibodies that block or destroy the acetylcholine receptors on the sarcolemma (muscle cell membrane). This prevents nerve signals from effectively reaching the muscles.
• This weakening and paralysis of skeletal muscles can make simple tasks very difficult. As the disease gets worse, it can cause problems with chewing, swallowing, talking, and even breathing, showing how vital proper nerve-muscle communication is.
In simple words: Myasthenia gravis is a disease where the body's own immune system attacks muscle connections, causing muscles to become weak and tired.

🎯 Exam Tip: Remember that myasthenia gravis is an autoimmune disease directly impacting the neuromuscular junction, specifically the acetylcholine receptors.

 

Question 11. Give notes on muscle fatigue.
Answer:
• Muscle fatigue is the inability of a muscle to contract effectively after repeated or prolonged muscle contraction. This means the muscle can no longer perform at its usual level.
• This condition is primarily due to a lack of ATP (energy) and the accumulation of lactic acid, which results from the anaerobic breakdown of glucose. When muscles work hard without enough oxygen, lactic acid builds up and interferes with contraction.
In simple words: Muscle fatigue happens when your muscles get too tired to work properly, usually from lack of energy (ATP) and a buildup of lactic acid.

🎯 Exam Tip: Key factors in muscle fatigue are ATP depletion and lactic acid accumulation; understanding these helps explain why muscles tire.

 

Question 12. Give notes on Atrophy of muscles.
Answer:
• Atrophy of muscles refers to a decrease in the activity or size of muscles, resulting in their weakening. This is essentially a shrinking or wasting away of muscle tissue.
• There is a noticeable reduction in the overall size of the muscle, which makes it weak. This often occurs due to a lack of usage, for example, in patients who are chronically bedridden and cannot move their muscles regularly.
In simple words: Muscle atrophy is when muscles get smaller and weaker, often because they are not used enough.

🎯 Exam Tip: Atrophy is characterized by reduced muscle size and strength, usually due to disuse or certain medical conditions, emphasizing the "use it or lose it" principle for muscles.

 

Question 13. What is meant by muscle pull?
Answer:
• A muscle pull is essentially a muscle tear. It occurs when muscle fibres are stretched beyond their normal capacity or torn. This injury often causes sudden pain.
• Atraumatic pulling of the fibres can lead to a tear known as a sprain. This can happen suddenly during an activity or even from improper posture.
• This type of injury can occur due to a sudden overstretching of the muscle beyond its elastic limit. Back pain is also a common problem caused by muscle pull due to incorrect posture or prolonged static sitting.
In simple words: A muscle pull is when muscle fibres tear because they are stretched too much, causing pain and weakness.

🎯 Exam Tip: Understand that a muscle pull is a tear of muscle fibres, often caused by overstretching or improper movement, leading to pain and limited function.

 

Question 14. What is meant by muscular dystrophy?
Answer:
• Muscular dystrophy is a group of genetic diseases characterized by the progressive degeneration of skeletal muscle fibres. This means the muscles gradually weaken over time.
• The condition leads to the weakening of muscles and can eventually cause serious health problems, including death from lung or heart failure. Duchenne muscular dystrophy is a well-known example of this group of diseases, highlighting their severe impact.
In simple words: Muscular dystrophy is a group of diseases that cause muscles to get weaker and break down over time, often leading to serious health issues.

🎯 Exam Tip: Differentiate muscular dystrophy as a genetic, progressive muscle degeneration, distinct from temporary muscle fatigue or acute injuries.

 

Question 15. What is meant by skeletal muscle glycogen analysis?
Answer:
• Skeletal muscle glycogen analysis is a method used to measure the amount of glycogen stored in an athlete's muscles. Glycogen is the primary storage form of glucose in the body.
• Muscle glycogen serves as the main source of energy during anaerobic exercise (activities that don't use oxygen). It's crucial for high-intensity, short-duration efforts.
• A single glycogen molecule is quite large and can contain up to 5000 glucose molecules. Analyzing glycogen levels helps understand an athlete's energy reserves and training effectiveness.
In simple words: Skeletal muscle glycogen analysis measures how much stored sugar (glycogen) is in muscles, which is the main energy source for hard exercise.

🎯 Exam Tip: Connect glycogen analysis to its purpose: assessing energy reserves for anaerobic exercise, a key aspect of sports science.

 

Question 16. Give notes on osteoporosis?
Answer:
• Osteoporosis is a condition that occurs due to a deficiency of vitamin D and hormonal imbalance. This leads to a decrease in bone density, making bones weak.
• In children, similar deficiencies can cause rickets, and in adult females, it can lead to osteomalacia, both affecting bone health.
• The bones become soft and fragile, making them more prone to fractures. This condition can be largely prevented or minimized with adequate calcium intake, sufficient vitamin D intake, and regular physical activities that strengthen bones.
In simple words: Osteoporosis makes bones weak and fragile due to low vitamin D or hormone problems, but calcium and exercise can help prevent it.

🎯 Exam Tip: Key risk factors for osteoporosis are vitamin D deficiency and hormonal imbalances, leading to fragile bones; prevention involves calcium, vitamin D, and exercise.

 

Question 17. What is carpal tunnel syndrome?
Answer:
• Carpal tunnel syndrome occurs when the narrow passage in the wrist, bounded by bones and ligaments, becomes narrowed. This narrowing then pinches the median nerve, which runs through it.
• This syndrome is frequently observed in clerks, software professionals, and individuals who constantly play or text on mobile phones. Repetitive hand movements and prolonged wrist positions are common contributing factors.
In simple words: Carpal tunnel syndrome happens when a nerve in the wrist gets squeezed due to the tunnel becoming too narrow, often from repeated hand use.

🎯 Exam Tip: Recognize carpal tunnel syndrome as a nerve compression issue in the wrist, often linked to repetitive hand strain in certain professions.

V. Give Detailed Answers

 

Question 1. Describe about the different types of movements with examples.
Answer: Movements are a fundamental characteristic of living organisms. They can be broadly categorized into several types:
1. Amoeboid movements
2. Ciliary movements
3. Flagellar movements
4. Muscular movements

1. Amoeboid movements: These movements are shown by cells such as macrophages (immune cells) and amoeba. They move by forming temporary extensions of their cytoplasm called pseudopodia, which allows them to engulf pathogens or move across surfaces.

2. Ciliary movements: This type of movement involves small, hair-like structures called cilia. Ciliary movement occurs in various parts of the body, such as the respiratory passages to clear mucus and dust, and in the genital passages to move eggs or sperm.

3. Flagellar movement: Flagellar movement is carried out by cells that possess flagella, which are longer, whip-like structures. A prime example is sperm cells, which use their flagella to propel themselves through fluids, enabling fertilization.

4. Muscular movement: This is the most common type of movement in higher animals. The movement of body parts like hands, legs, and jaws are caused by the contraction and relaxation of muscles. This allows for complex actions such as walking, running, and lifting.
In simple words: Living things move in different ways: amoeboid movement (like immune cells), ciliary movement (like in air passages), flagellar movement (like sperm), and muscular movement (like moving arms and legs).

🎯 Exam Tip: For each type of movement, provide a clear definition and a relevant example, distinguishing between cellular and whole-body movements.

 

Question 2. Describe the structure of sarcomere.
Answer: The sarcomere is considered the basic functional unit of a skeletal muscle. It is the specific region of a myofibril located between two consecutive Z-discs, and its organized structure is what gives skeletal muscle its striated appearance.

• The sarcomere contains an 'A' band (dark band) in its center, flanked by two 'I' bands (light bands), one on each side. These bands are perfectly aligned with one another across the myofibrils. The arrangement of these dark and light bands gives the muscle cell its characteristic striated, or striped, appearance.

• Within each dark A-band, there is a lighter region in its middle called the H-zone. This H-zone is further bisected vertically by a dark line known as the M-line. The I-bands also have a darker mid-line area called the Z-disc, which marks the boundaries of each sarcomere.

• Inside the sarcomere, two main types of filaments are present: thick filaments and thin filaments. These filaments are the contractile proteins responsible for muscle contraction. The thick filaments extend throughout the entire length of the A-band. The thin filaments, on the other hand, extend across the I-band and partly into the A-band, creating overlap. The cell membrane, called the sarcolemma, has inward folds called transverse (T-tubules) tubules. These tubules penetrate into the muscle fibre at the junction between the A and I bands, helping to transmit electrical signals deep into the muscle.
In simple words: A sarcomere is the smallest part of a muscle that can contract. It's found between two Z-discs and has dark A-bands and light I-bands, made of thick and thin filaments that slide past each other for movement.

🎯 Exam Tip: Clearly define a sarcomere as the functional unit, explain the A-band, I-band, H-zone, M-line, and Z-disc, and describe the arrangement of thick and thin filaments within these zones.

 

Question 3. Describe the structure of muscle protein.
Answer: Muscle contraction relies on the presence of two primary contractile proteins: actin and myosin. Each of these proteins has a distinct structure essential for its role.

Myosin fibre:
• The thick filaments within muscle fibres are primarily composed of the protein myosin. Myosin is a large molecule with a unique structure.
• Each myosin molecule is made up of smaller units called meromyosin. These meromyosin units are the building blocks of the thick filament.
• A meromyosin molecule consists of a globular head, a short arm, and a tail. The tail portion is lighter, known as light meromyosin (LMM), while the head and short arm form the heavy meromyosin (HMM).
• The globular head of the myosin molecule is crucial as it bears two important sites: an actin-binding site and an ATP-binding site. This head also contains ATPase enzyme, which splits ATP to provide the necessary energy for muscle contraction. The way these heads interact with actin is central to the sliding filament theory.
Actin filament:
• The thin filament primarily consists of actin, which has polypeptide subunits. These subunits are called globular actin (G-actin) and, when polymerized, form filamentous actin (F-actin).
• Each thin filament is made of two F-actin strands that are helically wound around each other, much like two strings twisted together. Each F-actin is a polymer of many G-actin molecules.
• The thin filament also contains a binding site for myosin, which is usually covered until a muscle contraction signal is received.
• In addition to actin, the thin filament contains several regulatory proteins: tropomyosin and troponin. These proteins play a vital role in controlling muscle contraction by regulating the interaction between actin and myosin.
Thick filament:
Each thick filament consists of many myosin molecules. The heads of these myosin molecules are arranged at opposite ends of the filament, pointing outwards. This arrangement allows them to bind to the thin filaments and pull them during contraction.
In simple words: Muscle proteins are mainly actin (thin filament) and myosin (thick filament). Myosin has a head that binds to actin and uses energy from ATP, while actin has regulatory proteins like troponin and tropomyosin that control when it can bind to myosin.

🎯 Exam Tip: When describing muscle proteins, explain the structure of both actin (thin, with troponin and tropomyosin) and myosin (thick, with heads that bind actin and ATP), highlighting their roles in forming the filaments.

 

Question 4. Give the schematic representation of muscle contraction.
Answer: Muscle contraction is a complex process initiated by a signal from the central nervous system (CNS) and involving a series of biochemical and mechanical steps. Here is a schematic representation of the process:

In simple words: Muscle contraction starts with a brain signal, causing chemicals to release, calcium to appear, and muscle proteins to slide together, making the muscle shorter, and then they relax when the signal stops.

🎯 Exam Tip: When explaining muscle contraction, emphasize the sequence: nerve impulse, acetylcholine release, calcium release, actin-myosin binding, power stroke, and detachment/relaxation. A clear flowchart can help visualize these steps.

 

Question 5. Give the four important features of skeletal muscles.
Answer: Skeletal muscles possess several key features that enable their crucial role in movement and support:
1. Excitability: This is the muscle's ability to respond to chemical and electrical excitations. When a nerve sends a signal, the muscle fibre becomes excited and is ready to contract. This responsiveness is vital for initiating any movement.
2. Contractility: This refers to the muscle's unique ability to shorten forcefully. It is the property that allows the muscle to pull on attached organs, such as bones, thereby causing movement. Without contractility, muscles could not generate force.
3. Conductivity: Once one part of the muscle receives an excitation signal, it can transmit this signal throughout the rest of the muscle. This means the excitation at one part of the muscle is quickly passed to other parts, ensuring a coordinated contraction.
4. Elasticity: This is the muscle's capacity to return to its original length and shape after being stretched or contracted. After the extension or contraction of the muscles, they can recoil and resume their resting state, which prevents permanent deformation and helps prepare for the next movement.
In simple words: Skeletal muscles can get excited by signals, they can shorten to pull things, they can spread signals quickly, and they can snap back to their original shape after moving.

🎯 Exam Tip: Remember the four E's of muscle function: Excitability (responds to stimuli), Contractility (shortens forcefully), Conductivity (transmits signals), and Elasticity (returns to original shape).

 

Question 6. Explain the bones that form the skull?
Answer: The skull is a complex bony structure that protects the brain and forms the framework of the face. It is made up of two main sets of bones: cranial bones and facial bones.

The skull contains a total of 22 bones, with 8 being cranial bones and 14 being facial bones. The cranial bones form the rigid, protective outer covering for the brain, commonly referred to as the brain box. The brain box, or cranium, has a capacity of approximately 1500 cubic centimeters.

These bones are connected by strong, immovable joints called sutures. The cranial bones include:
• Paired parietal bones
• Paired temporal bones
• Individual bones such as the frontal bone, sphenoid bone, occipital bone, and ethmoid bone.

A large opening in the temporal bone is called the external auditory meatus, which leads to the ear canal.

The facial bones make up the front part of the skull. These include:
• Paired facial bones like the maxilla (upper jaw), zygomatic (cheekbones), palatine, lacrimal, and nasal bones.
• Unpaired bones like the mandible (lower jaw) and vomer.

A unique U-shaped hyoid bone is located at the base of the buccal cavity (mouth floor). It is the only bone in the body that does not directly connect to any other bone, playing a role in tongue movement and swallowing.

Each middle ear contains three tiny bones, collectively called ear ossicles: malleus, incus, and stapes. These bones are crucial for hearing. The upper jaw (maxilla) is firmly attached to the cranium and is immovable, while the lower jaw (mandible) is connected to the cranium by muscles, making it movable for chewing and talking. The skull also has prominent openings like the orbits (for eyes) and the nasal cavity. A large opening at the back-bottom of the skull, called the foramen magnum, allows the medulla oblongata (part of the brainstem) to pass down and connect with the spinal cord.
In simple words: The skull protects the brain and forms the face, made of 8 cranial bones (like frontal, parietal, temporal) and 14 facial bones (like maxilla, mandible). These bones are mostly fixed together, except for the lower jaw, and have openings for senses and the spinal cord.

🎯 Exam Tip: When describing the skull, remember to categorize bones into cranial and facial, mention their immovability (except mandible), and highlight key features like sutures, foramina, and the hyoid bone.

 

Question 7. Give an account of vertebral column.
Answer: The vertebral column, also known as the backbone or spine, is a crucial part of the axial skeleton. It is a long, flexible column that supports the head, protects the spinal cord, and serves as an attachment point for ribs and back muscles. The vertebral column consists of 33 serially arranged vertebrae, which are individual bones. These vertebrae are interconnected by tough pads of cartilage called intervertebral discs, allowing for flexibility and shock absorption. The column extends from the base of the skull down to the pelvis, forming the main framework of the trunk.

The vertebral column is divided into five major regions:
1. Cervical vertebrae (7): These are the seven vertebrae in the neck region, supporting the head.
2. Thoracic vertebrae (12): These twelve vertebrae are located in the upper back and connect to the ribs.
3. Lumbar vertebrae (5): These five large vertebrae are in the lower back, supporting most of the body's weight.
4. Sacrum (5 sacral vertebrae): In infants, there are five separate sacral vertebrae, but in adults, they fuse together to form a single bone called the sacrum, which connects to the pelvic girdle.
5. Coccyx (1-4 coccygeal vertebrae): Similar to the sacrum, one to four coccygeal vertebrae are present in infants but fuse to form a single bone in adults, commonly known as the tailbone.
In simple words: The vertebral column is our backbone, made of 33 small bones called vertebrae, separated by discs. It protects the spinal cord, supports the head, and connects to ribs, split into cervical, thoracic, lumbar, sacrum, and coccyx regions.

🎯 Exam Tip: When describing the vertebral column, highlight its protective and supportive roles, mention the intervertebral discs, and accurately list the number of vertebrae in each of the five regions.

 

Question 8. Give an account of the ribcage.
Answer: The ribcage is made up of 12 pairs of ribs. Each rib connects at the back to the vertebral column and at the front to the sternum (breastbone). Each rib has two connecting points at its back end. The first seven pairs are called true ribs because they directly join the thoracic vertebrae and the sternum using cartilage. The 8th, 9th, and 10th pairs are called false ribs; they connect to the cartilage of the seventh rib instead of directly to the sternum. The last two pairs, the 11th and 12th, are known as floating ribs because they do not connect to the sternum at all at the front. This structure provides vital protection for the organs inside the chest, such as the heart and lungs.
In simple words: The ribcage protects organs like the heart and lungs, and it helps with breathing. It has 12 pairs of ribs, which connect to the spine at the back, and some also connect to the breastbone at the front.

🎯 Exam Tip: Remember the three types of ribs - true, false, and floating - and how they connect to the sternum and vertebral column. Mentioning the number of pairs for each type is key.

 

Question 9. Give an account of the pectoral girdle?
Answer: The pectoral girdle is what connects your upper limbs (arms) to the body's main skeleton. It is very light and lets your arms move freely in many directions. This girdle is made of two halves, one for each side of your body. Each half has two bones: a clavicle, which is also known as the collar bone, and a scapula, also called the shoulder blade. The scapula is a big, triangle-shaped bone located on the back of your ribcage, usually between the second and seventh ribs. It has a raised, flat part called the acromion. The clavicle also supports the shoulder, preventing it from collapsing inward. This structure allows for a wide range of motion in the shoulder joint.
In simple words: The pectoral girdle is made of your collarbone and shoulder blade. It connects your arms to your body and allows for a lot of movement.

🎯 Exam Tip: Focus on the main function of the pectoral girdle (connecting upper limbs, mobility) and its key bones: clavicle and scapula. The acromion is a specific part of the scapula that helps form the shoulder.

 

Question 10. Describe the structure of the upper limb.
Answer: Your upper limb, or arm, has 30 bones designed for lots of movement. The top part is the humerus, a single bone running from your shoulder to your elbow. The round top part of the humerus connects with a cup-shaped area in your shoulder blade (scapula) to form the shoulder joint. At the other end, the humerus joins with two forearm bones, the radius and the ulna. The pointed tip of your elbow is called the olecranon process, which is part of the ulna bone. Your hand includes smaller bones called carpals (wrist bones), metacarpals (palm bones), and phalanges (finger bones). The 8 wrist bones are arranged in two rows, forming a small tunnel called the carpal tunnel, which protects important nerves and blood vessels.
In simple words: Your arm has 30 bones, including the humerus (upper arm), radius and ulna (forearm), and many small bones in your wrist and hand. They all work together for movement.

🎯 Exam Tip: When describing limb bones, start from the top (shoulder) and work your way down to the extremities (fingers/toes). Group smaller bones like carpals together.

 

Question 11. Give an account of pelvic girdle.
Answer: The pelvic girdle is a strong and heavy set of bones built to support the body's weight. It connects your lower limbs (legs) to your main body skeleton. This girdle is made of two large hip bones, also called coxal bones. Together with the sacrum and coccyx bones at the base of the spine, they form a bowl-shaped structure known as the bony pelvis. Each hip bone is actually made of three smaller bones fused together: the ilium, ischium, and pubis. Where these three bones meet, there is a deep, cup-like hollow called the acetabulum, which is where the top of your thigh bone (femur) fits in. This robust design is crucial for standing, walking, and maintaining balance.
In simple words: The pelvic girdle is your hip bones. It supports your body's weight, connects your legs to your body, and has a socket for your thigh bone.

🎯 Exam Tip: Highlight the pelvic girdle's role in weight-bearing and connecting the lower limbs. Mention the three fused bones (ilium, ischium, pubis) and the acetabulum.

 

Question 12. Give an account of the lower limb.
Answer: Your lower limb, or leg, has 30 bones, just like your arm, but these bones are thicker and stronger because they carry the entire weight of your body. They also handle strong forces when you jump or run. Each lower limb is divided into the thigh, the leg (or shank), and the foot. The thigh bone, called the femur, is the longest and strongest bone in your body. The top part of the femur fits into the acetabulum of the pelvic bone, forming the hip joint. This robust design is essential for stability and movement, allowing us to stand and walk upright.
In simple words: Your leg has 30 strong bones, including the thigh bone (femur), and bones in your lower leg and foot. They support your body weight and help you move.

🎯 Exam Tip: Contrast the lower limb with the upper limb, emphasizing its strength and weight-bearing function. List the main sections and their key bones.

 

Question 13. Give an account of a structure of a typical long bone.
Answer: A typical long bone has three main parts: a long middle shaft (called the diaphysis) and two ends (called epiphyses). The shaft is like a hollow tube, and inside it is a space called the medullary cavity. The bone ends, the epiphyses, are covered on the outside by strong, compact bone, but inside they have spongy bone that holds red marrow. The area where the shaft meets the ends is called the metaphysis. The entire outside of the bone, except for the joint surfaces, is covered by a tough, two-layered membrane called the periosteum. This periosteum is full of nerves, blood vessels, and special cells that help the bone grow and repair itself. Inside the bone, the surfaces are lined by another delicate membrane called the endosteum, which also has cells that form and break down bone. Between the shaft and the ends, there is a growth plate (epiphyseal plate) that allows bones to get longer during childhood and adolescence.
In simple words: A long bone has a main shaft and two ends. The outside is hard, and the inside has spongy bone or marrow. Special coverings on the outside (periosteum) and inside (endosteum) help the bone grow and heal.

🎯 Exam Tip: When describing a long bone, clearly define the diaphysis, epiphyses, and metaphysis. Also, remember to mention the periosteum and endosteum as important outer and inner linings that aid in bone health and repair.

 

Question 14. Write a short note on Rib cage?
Answer: The rib cage is a bony structure that protects vital organs like the heart, lungs, and liver, and it also plays a role in breathing. It is made of 12 pairs of thin, flat ribs. Each rib connects to the vertebral column at the back and to the sternum (breastbone) at the front, though not always directly. The first seven pairs are called "true ribs" because they have their own direct connection to the sternum with cartilage. The 8th, 9th, and 10th pairs are "false ribs"; they attach to the cartilage of the seventh rib instead of directly to the sternum. The last two pairs, the 11th and 12th, are "floating ribs" because they are only attached at the back and do not connect to the sternum at all. The unique flexibility of the rib cage allows it to expand and contract, which is vital for respiration.
In simple words: The rib cage protects organs and helps us breathe. It consists of true ribs (direct connection to breastbone), false ribs (indirect connection), and floating ribs (no front connection).

🎯 Exam Tip: Focus on the protective function and the three classifications of ribs based on their sternal attachment, including their numbers (7 true, 3 false, 2 floating).

 

Question 15. Tabulate the differentiate of joints man
Answer: Here is a table showing different types of joints and where they are found in the human body:

In simple words: Joints are like hinges that let our bones move. Different joints allow different kinds of movement and are found in specific places, like the knee, wrist, or neck.

🎯 Exam Tip: Be sure to list the correct anatomical location for each joint type. Understanding the motion each joint allows can help you remember its location.

 

Question 16. Draw the diagram of different types of fracture and arrange them.
Answer: No specific textual answer is provided for this question, which asks for diagrams of different fracture types. Common types of fractures include closed, transverse, oblique, spiral, greenstick, and comminuted fractures.
In simple words: Different kinds of bone breaks, like a straight break, a slanted break, or a twisted break, are called fractures. To show them, you would draw what the broken bone looks like for each type.

🎯 Exam Tip: When asked to draw diagrams, clearly label all parts and show distinct features. For fractures, illustrate the break pattern in the bone for each type.

 

Question 17. Bones of the skeletal system. Table: 1 Bones of skeletal system
Answer: Below is a table detailing the bones that make up the human skeletal system, categorized by their location and type.

In simple words: Our body's skeleton is split into two main parts: the axial skeleton (head, spine, ribs) and the appendicular skeleton (arms, legs, and their connecting girdles). Each part has many bones, from the tiny ear bones to the large thigh bone, all working together to help us move and protect our organs.

🎯 Exam Tip: Practice drawing simple diagrams of the skeletal system to reinforce the location and classification of bones. Pay attention to the distinction between axial and appendicular skeletons.

Notes:
1. The masseter muscle in the cheeks is the strongest muscle in the human body.
2. The stapedius muscle in the middle ear is the smallest muscle in the human body.
3. The tongue is considered a well-moving muscle.
4. The gluteus maximus, located in the buttock, is the largest muscle in the human body.
5. The sartorius muscle, running from the hip to the knee, is the longest muscle in the human body.
6. In adults, the total number of bones in the human body is 206.

 

Question 18. Explain the basic categories of exercise and physical activity?
Answer: Exercise and physical activity are split into four main groups, each with different benefits for your body. First, there's Endurance (or aerobic) activity, like running, which makes your heart beat faster and helps your breathing. This keeps your heart and blood system healthy and improves your overall fitness. Second are Strength exercises, such as lifting weights, which build stronger muscles. Stronger muscles help you do daily tasks, like climbing stairs or carrying groceries, more easily. Third, Balance exercises help you stay steady on your feet and prevent falls, especially important as people get older. Many strength exercises also improve balance. Lastly, Flexibility exercises, like stretching, help your muscles and joints move more freely. Each category of exercise works together to create a well-rounded fitness routine, improving various aspects of physical health.
In simple words: There are four main kinds of exercise: endurance (like running), strength (like lifting weights), balance (like standing on one leg), and flexibility (like stretching). Each type helps your body in a different way to keep you healthy and able to move well.

🎯 Exam Tip: When explaining exercise categories, define each type, give an example if possible, and describe the specific health benefits associated with it.