NEET Biology Body Fluids and Circulation MCQs Set 22

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Chapter-wise Objective Questions: Body Fluids and Circulation

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Multiple Choice Questions

Question 1: Granulocytes are formed in
(a) Thymus
(b) Bone marrow
(c) Kidney
(d) Liver
Show Answer & Explanation

Answer: (b) Bone marrow

Explanation:
1. Granulocytes are basically a type of leucocytes and formation of leucocyte i.e. leucopoiesis occurs in bone marrow.

Question 2: Immunity is provided by
(a) Erythrocytes
(b) Lymphocytes
(c) Megakaryocytes
(d) Thrombocytes
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Answer: (b) Lymphocytes

Explanation:
1. Lymphocytes are agranulocytes WBC, which exist in two forms i.e., B-lymphocyte and T-lymphocytes and these are responsible for immune response of the body.
2. Erythrocytes : These are also known as RBC, which help in gaseous transportation i.e., O2 and CO2.
3. Thrombocytes : These are also called platelets and are formed from the megakaryocytes (large cells of bone marrow).

Question 3: Which of the following are phagocytic in nature?
(a) Monocytes
(b) Macrophages
(c) Neutrophils
(d) All of these
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Answer: (d) All of these

Explanation:
1. Monocytes, macrophages and neutrophils are phagocytic in nature because these cells can engulf the foreign structure like bacteria.

Question 4: ______ are cell fragments rather than true cells.
(a) Erythrocytes
(b) Granulocytes
(c) Thrombocytes
(d) Agranulocytes
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Answer: (c) Thrombocytes

Explanation:
1. Thrombocytes i.e. platelets are small, colourless, enucleated fragment of megakaryocytes.

Question 5: Which of the following formed element activates the plasma clotting factors?
(a) Erythrocytes
(b) Monocytes
(c) Lymphocytes
(d) Thrombocytes
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Answer: (d) Thrombocytes

Explanation:
1. Blood platelets on disintegration produce thromboplastin (platelet factor 3), which start the chain of clotting reactions.

Question 6: Blood group AB has
(a) No antigen
(b) No antibody
(c) Neither antigen nor antibody
(d) Both antigen and antibody
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Answer: (b) No antibody

Explanation:
1. Person with AB blood group have both antigen A and antigen B, but do not have any antibodies.
2. AB blood also called universal recipient.

Question 7: In ABO system of blood grouping, transfusion is not possible from
(a) A to AB
(b) B to AB
(c) O to O
(d) A to O
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Answer: (d) A to O

Explanation:
1. This is so because blood group 'O' is universal donor but can accept blood from 'O' blood group person.

Question 8: Erythroblastosis foetalis can occur if
(a) Mother is Rh-ve and foetus is Rh+ve
(b) Both mother and foetus are Rh–ve
(c) Mother is Rh+ve and foetus is Rh–ve
(d) Both mother and foetus are Rh+ve
Show Answer & Explanation

Answer: (a) Mother is Rh-ve and foetus is Rh+ve

Explanation:
1. Mother Father (Rh –ve) (Rh +ve) + st (Rh ) I child (Normal) + nd (Rh ) II child (Erythroblastosis foetalis) If father is Rh+ and mother is Rh–, the foetus can be Rh– or Rh+. This occurs when mother is Rh– and foetus is Rh+. This is a serious problem.
2. If the Rh– blood of mother has not earlier come in contact with Rh+ blood through transfusion, her first child does not suffer.
3. But in the subsequent Rh+ foetuses, the antibodies against Rh antigen of the mother's blood destroy the foetal RBC. This results in erythroblastosis foetalis.

Question 9: Blood platelets release
(a) Fibrinogens
(b) Prothrombins
(c) Hemoglobin
(d) Thromboplastins
Show Answer & Explanation

Answer: (d) Thromboplastins

Explanation:
1. Blood platelets on disintegration release thromboplastin (platelets factor 3) which starts the chain of blood clotting reaction.

Question 10: Prothrombin that helps in clotting of blood, is present in
(a) Blood plasma
(b) Blood corpuscles
(c) Blood platelets
(d) Serum
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Answer: (a) Blood plasma

Explanation:
1. Prothrombin is an inactive plasma protein, which helps in clotting of blood.

Question 11: Which of the following prevent(s) blood clotting in uninjured blood vessels?
(a) Albumins
(b) Histamine
(c) Heparin
(d) Globulins
Show Answer & Explanation

Answer: (c) Heparin

Explanation:
1. This is so because heparin is an anticoagulant which prevents clotting of blood.

Question 12: Human heart is derived from
(a) Ectoderm
(b) Mesoderm
(c) Endoderm
(d) Both (1) & (3)
Show Answer & Explanation

Answer: (b) Mesoderm

Explanation:
1. This is so because the origin of all muscle except ciliary muscle, has mesodermal origin.

Question 13: Mixing of oxygenated and deoxygenated blood occurs in the heart of
(a) Bird
(b) Crocodile
(c) Rabbit
(d) Frog
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Answer: (d) Frog

Explanation:
1. This is so because frog has three-chambered heart with two atria and a single ventricle.
2. In frogs, both oxygenated and deoxygenated blood get mixed up in the single ventricle and the heart pumps out mixed blood.
3. This is known as incomplete double circulation.

Question 14: How many cardiac cycles are performed per minute in humans?
(a) 1
(b) 12
(c) 27
(d) 72
Show Answer & Explanation

Answer: (d) 72

Explanation:
1. Our heart beats 72 times per minute i.e., 72 cardiac cycles are performed per minute and one cardiac cycle would occur in 0.8 second.

Question 15: Oxygenated blood from the left ventricle enters into
(a) Pulmonary artery
(b) Aorta
(c) Superior vena cava
(d) Pulmonary trunk
Show Answer & Explanation

Answer: (b) Aorta

Explanation:
1. Lungs LA = Left atrium Pulmonary artery Pulmonary vein LV = Left ventricle RA = Right atrium RV = Right ventricle RA LA Heart RV LV Vena cava Aorta Body parts.

Question 16: How many double circulations are normally completed by human heart in one minute?
(a) Eight
(b) Sixteen
(c) Thirty six
(d) Seventy two
Show Answer & Explanation

Answer: (d) Seventy two

Explanation:
1. Our heart normally beats 72 times per minute and in every beat the blood passes through the heart twice, which includes pulmonary and systemic circulation.

Question 17: Systemic circulation of oxygenated blood starts from
(a) Right atrium
(b) Left atrium
(c) Left ventricle
(d) Right ventricle
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Answer: (c) Left ventricle

Explanation:
1. In pulmonary circulation, blood flows from right ventricle to left atrium.
2. In systemic circulation, blood flows from left ventricle to right atrium.

Question 18: Coronary sinus carries _____ to the right atrium.
(a) Interstitial fluid
(b) Deoxygenated blood
(c) Lymph
(d) Oxygenated blood
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Answer: (b) Deoxygenated blood

Explanation:
1. Lungs LA = Left atrium Pulmonary artery Pulmonary vein LV = Left ventricle (Deoxygenated blood) (Oxygenated blood) RA = Right atrium RV = Right ventricle RA LA RV LV Vena cava and Aorta Coronary sinus (oxygenated blood) Body parts.

Question 19: The walls of capillaries are composed of endothelium which is
(a) Cuboidal epithelium
(b) Squamous epithelium
(c) Columnar epithelium
(d) Stratified epithelium
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Answer: (b) Squamous epithelium

Explanation:
1. The walls of capillaries are composed of just one cell layer – a simple squamous epithelium or endothelium, which permits a more rapid exchange of materials between the blood and tissues.

Question 20: Tunica externa is composed of
(a) Endothelium
(b) Connective tissue
(c) Smooth muscles
(d) Glycoproteins
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Answer: (b) Connective tissue

Explanation:
1. Tunica externa is the outermost layer of artery and vein wall and is composed of connective tissue.

Question 21: A special neural centre that can moderate the cardiac function is located in
(a) Cerebrum
(b) Pons
(c) Medulla oblongata
(d) Cerebellum
Show Answer & Explanation

Answer: (c) Medulla oblongata

Explanation:
1. Cardiac rhythm centres are located in medulla oblongata.

Question 22: T-lymphocytes mature in
(a) Bone marrow
(b) Lymph nodes
(c) Bursa of fabricius
(d) Thymus
Show Answer & Explanation

Answer: (d) Thymus

Explanation:
1. Thymus is the primary lymphoid organ where maturation of T lymphocytes takes place.
2. B cell maturation occurs in bone marrow.

Question 23: The granulocyte to arrive first at the site of an infection is
(a) Neutrophil
(b) Eosinophil
(c) Basophil
(d) All of these
Show Answer & Explanation

Answer: (a) Neutrophil

Explanation:
1. Neutrophils : They are the most abundant leucocytes (60–65%), which have phagocytic nature i.e., they engulf the harmful germ.
2. Eosinophils (2–3% of total leucocytes) : They are non-phagocytic and their number increases in people with allergic condition such as asthma or hay fever.
3. Basophils (0–1% of total leucocytes (least)) : They release heparin, serotonin and histamine.

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Multiple Choice Questions (MCQs) for NEET Biology Body Fluids and Circulation

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FAQs

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