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Body Fluids and Circulation MCQs for NEET — Zoology Questions with Answers

Practice free Body Fluids and Circulation (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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NEET 2023

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Which of the following statements are correct?

A. Basophils are most abundant cells of the total WBCs. B. Basophils secrete histamine, serotonin and heparin. C. Basophils are involved in inflammatory response. D. Basophils have kidney shaped nucleus. E. Basophils are agranulocytes.

A. D and E only B. C and E only C. B and C only D. A and B only

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Explanation

Basophils are LEAST abundant, granular, with lobed nucleus. Only B and C correct.

NEET 2024

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Following are the stages of pathway for conduction of an action potential through the heart:

A. AV bundle B. Purkinje fibres C. AV node D. Bundle branches E. SA node

Choose the correct sequence of pathway from the options given below:

A. E-A-D-B-C B. E-C-A-D-B C. A-E-C-B-D D. B-D-E-C-A

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Explanation

Standard cardiac conduction pathway: SA node → AV node → AV bundle (bundle of His) → bundle branches → Purkinje fibres.

NEET 2024

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Match List I with List II:

List I	List II
A. P wave	I. Heart muscles are electrically silent.
B. QRS complex	II. Depolarisation of ventricles.
C. T wave	III. Depolarisation of atria.
D. T-P gap	IV. Repolarisation of ventricles.

Choose the correct answer from the options given below:

A. A-IV, B-II, C-I, D-III B. A-I, B-III, C-IV, D-II C. A-III, B-II, C-IV, D-I D. A-III, B-II, C-IV, D-I

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Explanation

P — atrial depolarisation; QRS — ventricular depolarisation; T — ventricular repolarisation; T-P gap — electrically silent diastole.

NEET 2024

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As per ABO blood grouping system, the blood group of father is $B^+$, mother is $A^+$ and child is $O^+$. Their respective genotype can be:

A. $I^Bi\ /\ I^Ai\ /\ ii$ B. $I^BI^B\ /\ I^AI^A\ /\ ii$ C. $I^AI^B\ /\ ii\,I^A\ /\ I^B$ D. $I^Ai\ /\ I^Bi\ /\ I^Ai$ E. $iiI^B\ /\ iiI^A\ /\ I^Ai$

Choose the most appropriate answer from the options given below:

A. D & E only B. A only C. B only D. C & B only

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Explanation

For child = $ii$, each parent must contribute one $i$. Father ($B$) must be $I^B i$; mother ($A$) must be $I^A i$ — only A satisfies this.

NEET 2025

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Match List - I with List - II:

List - I — A. Emphysema, B. Angina Pectoris, C. Glomerulonephritis, D. Tetany

List - II — I. Rapid spasms in muscle due to low Ca²⁺ in body fluid, II. Damaged alveolar walls and decreased respiratory surface, III. Acute chest pain when not enough oxygen is reaching to heart muscle, IV. Inflammation of glomeruli of kidney

Choose the correct answer:

A. A-III, B-I, C-IV, D-II B. A-III, B-I, C-II, D-IV C. A-II, B-IV, C-III, D-I D. A-II, B-III, C-IV, D-I

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Explanation

Emphysema → damaged alveolar walls (II); Angina pectoris → chest pain from low O₂ to heart (III); Glomerulonephritis → inflammation of glomeruli (IV); Tetany → muscle spasms from low Ca²⁺ (I).

NEET 2025

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Cardiac activities of the heart are regulated by: A. Nodal tissue B. A special neural centre in the medulla oblongata C. Adrenal medullary hormones D. Adrenal cortical hormones Choose the correct answer:

A. A, B and C Only B. A, B, C and D C. A, C and D Only D. A, B and D Only

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Explanation

The heart beat is initiated by nodal tissue (A), moderated by a neural centre in the medulla oblongata (B) via the autonomic nervous system, and by adrenal medullary hormones (C). Adrenal cortical hormones do not directly regulate cardiac activity.

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