Download NEET MCQs for NEET Biology: Body Fluids and Circulation
Access targeted multiple-choice questions for Body Fluids and Circulation designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.
Chapter-wise Objective Questions: Body Fluids and Circulation
View or download the dedicated Body Fluids and Circulation MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.
Multiple Choice Questions
(a) 8000
(b) 100000
(c) 5000
(d) 16000
Show Answer & Explanation
Answer: (a) 8000
Explanation:
1. WBC count in healthy people is about 6000 to 8000 per cubic mm, so 8000 is the best choice.
Teacher's Note:
1. The count rises in infection.
2. About 8000 per mm3.
(a) Plasma protein
(b) Antigen
(c) Serum
(d) Found in lymphatic tissue. HISTOLOGY OF HUMAN HEART, ANATOMY OF HUMAN HEART, HEARTS OF VERTOBRATES, CIRCULATORY PATHEWAYS
Show Answer & Explanation
Answer: (a) Plasma protein
Explanation:
1. Globulins are proteins of blood plasma, including the antibodies.
Teacher's Note:
1. Fibrinogen and albumin are other plasma proteins.
2. Globulin is a plasma protein.
(a) Columnae carinae
(b) Chordae tendinae
(c) Tendinae
(d) Pectinati muscles
Show Answer & Explanation
Answer: (b) Chordae tendinae
Explanation:
1. Chordae tendineae are thin tendon-like cords that connect the atrioventricular valve flaps to the papillary muscles.
Teacher's Note:
1. They prevent valves turning inside out.
2. Chordae tendineae join valves to muscles.
(a) Oxygenated blood
(b) Deoxygenated blood
(c) Both
(d) None
Show Answer & Explanation
Answer: (b) Deoxygenated blood
Explanation:
1. The heart of a fish has two chambers and pumps only deoxygenated blood to the gills.
Teacher's Note:
1. It is called a venous heart.
2. Fish heart has deoxygenated blood.
(a) Peritoneum
(b) Visceral membrane
(c) Pericardium
(d) None
Show Answer & Explanation
Answer: (c) Pericardium
Explanation:
1. The heart is enclosed in a double layered membrane, the pericardium, with fluid in between.
Teacher's Note:
1. The peritoneum surrounds abdominal organs.
2. The pericardium covers the heart.
(a) Right auricle
(b) Left auricle
(c) Right ventricles
(d) Left ventricle
Show Answer & Explanation
Answer: (d) Left ventricle
Explanation:
1. The left ventricle pumps blood to the whole body, so its wall is the thickest.
Teacher's Note:
1. Atria have thin walls.
2. Left ventricle is thickest.
(a) Fish
(b) Frog
(c) Rabbit
(d) Man
Show Answer & Explanation
Answer: (b) Frog
Explanation:
1. The frog has a three chambered heart with two atria and one ventricle.
Teacher's Note:
1. Fish have two chambers; rabbit and man have four.
2. Frog heart has three chambers.
(a) Bundle of HIS
(b) Ductus arteriosus
(c) Foramen ovale
(d) Chorda tendinae
Show Answer & Explanation
Answer: (d) Chorda tendinae
Explanation:
1. Chordae tendineae anchor the mitral (bicuspid) valve to papillary muscles so that it does not flap back.
Teacher's Note:
1. Mitral is between left atrium and ventricle.
2. Mitral valve is held by chordae tendineae.
(a) Mitral valve
(b) Tricuspid valve
(c) Bicuspid valve
(d) Semilunar valve
Show Answer & Explanation
Answer: (b) Tricuspid valve
Explanation:
1. The tricuspid valve lies between the right atrium and right ventricle. The bicuspid (mitral) valve is on the left side.
Teacher's Note:
1. Semilunar valves are in the aorta and pulmonary artery.
2. Tricuspid is on the right.
(a) Cockroach
(b) Fish
(c) Mosquito
(d) Housefly
Show Answer & Explanation
Answer: (b) Fish
Explanation:
1. Fish have a closed circulatory system where blood stays within vessels. Cockroach, mosquito and housefly have open systems.
Teacher's Note:
1. Annelids and chordates also have closed systems.
2. Fish have a closed system.
(a) Myocardium
(b) Perietal peritoneum
(c) Visceral peritoneum
(d) Pericardium
Show Answer & Explanation
Answer: (d) Pericardium
Explanation:
1. The pericardium secretes pericardial fluid that reduces friction as the heart beats.
Teacher's Note:
1. The fluid is in the pericardial cavity.
2. Pericardium secretes the fluid.
(a) The heart that contracts under stimulation from nervous system
(b) Left auricle and left ventricle in higher vertebrates
(c) Entire heart in lower vertebrates
(d) The two ventricles together in humans
Show Answer & Explanation
Answer: (b) Left auricle and left ventricle in higher vertebrates
Explanation:
1. The systemic heart pumps oxygenated blood to the body, i.e. the left auricle and left ventricle in higher vertebrates.
Teacher's Note:
1. The right half is the pulmonary heart.
2. Systemic heart is the left half.
(a) Scoliodon
(b) Rabbit
(c) Frog
(d) Human
Show Answer & Explanation
Answer: (c) Frog
Explanation:
1. In the frog's single ventricle oxygenated and deoxygenated blood mix considerably.
Teacher's Note:
1. Mammals have no mixing.
2. Frog ventricle has most mixing.
(a) c only
(b) c and b
(c) a and b
(d) a and d
Show Answer & Explanation
Answer: (d) a and d
Explanation:
1. Arthropoda and Mollusca have an open circulatory system in which blood flows in sinuses. Annelids and chordates have a closed system.
Teacher's Note:
1. Annelids are closed.
2. Arthropods and molluscs are open.
(a) Heart ventricle of rabbit
(b) Dermis of mammalian skin
(c) Orbit of vertebrates eyes
(d) Pylorus of vertebrate stomach
Show Answer & Explanation
Answer: (a) Heart ventricle of rabbit
Explanation:
1. Papillary muscles are muscular projections inside the heart ventricles to which chordae tendineae attach.
Teacher's Note:
1. They are present in rabbit, man and others.
2. They lie in ventricles.
(a) Brain
(b) Kidney
(c) Skin
(d) Heart
Show Answer & Explanation
Answer: (d) Heart
Explanation:
1. Purkinje fibres are specialised muscle fibres in the walls of the ventricles that spread the impulse.
Teacher's Note:
1. They are part of the conducting system.
2. Purkinje fibres are in the heart.
(a) The flow of blood into the pulmonary artery will be reduced
(b) The flow of blood into the aorta will be slowed down
(c) The 'pacemaker' will stop working
(d) The blood will tend to flow back into the left atrium CONDUCTING SYSTEM OF HEART, HEART BEAT, REGULATION OF CARDIAC ACTIVITY
Show Answer & Explanation
Answer: (a) The flow of blood into the pulmonary artery will be reduced
Explanation:
1. If the chordae tendineae of the tricuspid valve fail, blood leaks back into the right atrium during ventricular contraction, so less blood passes into the pulmonary artery.
Teacher's Note:
1. The right side is affected, not the left atrium.
2. Pulmonary flow is reduced.
(a) Purkinje fibres
(b) Cardiac branch of vagus nerve
(c) SA node
(d) AV node
Show Answer & Explanation
Answer: (c) SA node
Explanation:
1. The SA node (sino-atrial node) generates the impulse for the heart beat and is the pacemaker.
Teacher's Note:
1. AV node passes it on.
2. SA node starts the beat.
(a) Muscle fibres distributed throughout the heart walls
(b) Muscle fibres found only in the ventricle wall
(c) Nerve fibres distributed in ventricles
(d) Nerve fibres found throughout the heart
Show Answer & Explanation
Answer: (b) Muscle fibres found only in the ventricle wall
Explanation:
1. The bundle of His is a bundle of specialised cardiac muscle fibres that passes into the ventricular walls and divides into Purkinje fibres.
Teacher's Note:
1. It carries impulses from the AV node.
2. Bundle of His is in the ventricles.
(a) Right ventricle
(b) Left ventricle
(c) Right atrium
(d) Left atrium
Show Answer & Explanation
Answer: (c) Right atrium
Explanation:
1. The SA node lies in the upper right corner of the right atrium.
Teacher's Note:
1. It is the natural pacemaker.
2. SA node is in the right atrium.
(a) Unaffected
(b) Decreases
(c) Increases
(d) Stop
Show Answer & Explanation
Answer: (c) Increases
Explanation:
1. The parasympathetic (vagus) nerve slows the heart, so cutting it increases the heart rate.
Teacher's Note:
1. Sympathetic nerves speed it.
2. Cutting vagus speeds the heart.
(a) a, b
(b) a, b, c
(c) b, c, d
(d) all
Show Answer & Explanation
Answer: (c) b, c, d
Explanation:
1. Blood enters the atria when atria are relaxed, in joint diastole, while tricuspid and bicuspid valves are open.
Teacher's Note:
1. SAN impulse is for contraction.
2. b, c and d are correct.
(a) AV node ® S A node ® Bundle of His ® Purkinje fibres
(b) SA node ® AV node ® Bundle of His ® Purkinje fibres
(c) SA node ® Bundle of His ® AV node ® purkinje fibres
(d) AV node ® Bundle of His ® SA node ® Purkinje fibres
Show Answer & Explanation
Answer: (b) SA node ® AV node ® Bundle of His ® Purkinje fibres
Explanation:
1. The impulse travels from the SA node to the AV node, then the bundle of His and the Purkinje fibres.
Teacher's Note:
1. This makes ventricles contract after atria.
2. SA to AV to His to Purkinje.
(a) 50 ml, 5 L
(b) 5 L, 50 ml
(c) 70 ml, 5 L
(d) 120 ml, 5L
Show Answer & Explanation
Answer: (c) 70 ml, 5 L
Explanation:
1. Stroke volume is about 70 mL and cardiac output about 5 litres per minute (70 mL x 72 beats).
Teacher's Note:
1. Cardiac output equals stroke volume times heart rate.
2. SV 70 mL and CO 5 L.
(a) ‘Lub’ at end of systole
(b) ‘Dub’ at end of systole
(c) ‘Lub’ at begining of Ventricular systole
(d) ‘Dub’ at begining of Ventricular systole
Show Answer & Explanation
Answer: (c) ‘Lub’ at begining of Ventricular systole
Explanation:
1. The first heart sound lubb is produced by closure of tricuspid and bicuspid valves at the beginning of ventricular systole.
Teacher's Note:
1. The second sound dubb comes at the end.
2. Lubb is at start of ventricular systole.
(a) Bicuspid valve
(b) Tricuspid valve
(c) Semilunar valves
(d) Both (1) and (2)
Show Answer & Explanation
Answer: (d) Both (1) and (2)
Explanation:
1. The lubb sound arises from closure of both the bicuspid and tricuspid valves.
Teacher's Note:
1. Dubb is due to semilunar valves.
2. Both AV valves close for lubb.
Practice MCQs for NEET Biology Body Fluids and Circulation
Download Multiple Choice Questions: Body Fluids and Circulation (NEET Biology)
Review structured objective questions for NEET Biology Body Fluids and Circulation. Built according to official NEET guidelines, these MCQ sets support daily revision and core concept reinforcement.
Concept Clarification for Body Fluids and Circulation
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FAQs
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