NEET Biology · Chapter-wise PYQs

Body Fluids and Circulation NEET PYQs (2005–2026) with Solutions

Body Fluids and Circulation has appeared in 20 of the 22 NEET and AIPMT papers from 2005 to 2026, with 84 questions in all: about 3.8 per paper on average. The last five papers (2022–2026) had 22 questions from it.

The most-asked topics are Human Circulatory System (20), Digestion and Absorption (17) and Blood (16).

NEET MIND's syllabus map rates Body Fluids and Circulation as high weightage: about 3 questions (12 marks) in a NEET paper.

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PYQs in this chapter
84
Papers it appeared in
20 of 22
Average per paper
3.8
NEET weightage
High

10 solved Body Fluids and Circulation PYQs

Real NEET and AIPMT questions from this chapter, newest first. Try each one, then open the answer and the step-by-step explanation.

  1. Question 1 (NEET 2026)

    NEET 2026EasySA node as pacemaker
    The number of action potentials generated by sino-atrial node (SAN) in a healthy human is _______ per minute.
    1. Option A: 28 - 30
    2. Option B: 70 – 75
    3. Option C: 100 - 110
    4. Option D: 120 - 140
    Show answer & explanation

    Correct answer: (B) 70 – 75

    Explanation

    The SAN can generate the maximum number of action potentials, about 70–75 per minute, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Hence it is called the pacemaker. This is why the normal heart rate of a healthy human is 72 beats per minute (about 70–75). So the answer is option (B).

  2. Question 2 (NEET 2026)

    NEET 2026EasyCoagulation of blood
    Which of the following statements is incorrect?
    1. Option A: Blood coagulates in response to an injury
    2. Option B: Blood clot consists of fibrins
    3. Option C: Fibrin is produced from fibrinogen
    4. Option D: Fibrinogen is produced from fibrin
    Show answer & explanation

    Correct answer: (D) Fibrinogen is produced from fibrin

    Explanation

    Blood exhibits coagulation (clotting) in response to an injury or trauma, to prevent excessive loss of blood, so (A) is correct. A clot is formed mainly of a network of threads called fibrins in which dead and damaged formed elements are trapped, so (B) is correct. Fibrins are formed by the conversion of inactive fibrinogen in the plasma by the enzyme thrombin, so (C) is correct. The reverse, fibrinogen being produced from fibrin, is wrong. Hence the incorrect statement is option (D).

  3. Question 3 (NEET 2026)

    NEET 2026EasyHuman heart valves
    The opening between the right atrium and the right ventricle is guarded by _________.
    1. Option A: bicuspid valve
    2. Option B: tricuspid valve
    3. Option C: semilunar valve
    4. Option D: sino-atrial node
    Show answer & explanation

    Correct answer: (B) tricuspid valve

    Explanation

    The opening between the right atrium and the right ventricle is guarded by a valve formed of three muscular flaps or cusps, the tricuspid valve. The bicuspid (mitral) valve guards the opening between the left atrium and left ventricle, and semilunar valves guard the openings of the right and left ventricles into the pulmonary artery and aorta. The sino-atrial node is the pacemaker tissue in the right atrium, not a valve. Hence option (B).

  4. Question 4 (NEET 2026)

    NEET 2026MediumBlood
    The WBC count of a person's blood sample is 8000/cu mm. How many eosinophils and lymphocytes would be in the same blood sample approximately?
    1. Option A: 300 – 500/cu mm and 1200 – 1500/cu mm respectively
    2. Option B: 160 – 240/cu mm and 1600 – 2000/cu mm respectively
    3. Option C: 300 – 500/cu mm and 500 – 700/cu mm respectively
    4. Option D: 100 – 120/cu mm and 160 – 200/cu mm respectively
    Show answer & explanation

    Correct answer: (B) 160 – 240/cu mm and 1600 – 2000/cu mm respectively

    Explanation

    Eosinophils constitute ~2–3% of WBCs → 160–240/cu mm. Lymphocytes constitute ~20–25% → 1600–2000/cu mm out of 8000/cu mm total WBC count.

  5. Question 5 (NEET 2025)

    NEET 2025MediumBody fluids and circulation; Excretory products and their elimination; Locomotion and Movement
    Match List - I with List - II. Choose the correct answer from the options given below :
    1. Option A: A-III, B-I, C-IV, D-II
    2. Option B: A-III, B-I, C-II, D-IV
    3. Option C: A-II, B-IV, C-III, D-I
    4. Option D: A-II, B-III, C-IV, D-I
    Show answer & explanation

    Correct answer: (D) A-II, B-III, C-IV, D-I

    Explanation

    Emphysema is associated with damaged alveolar walls and decreased respiratory surface. Angina pectoris refers to chest pain due to insufficient oxygen supply to heart muscles. Glomerulo-nephritis is inflammation of glomeruli of kidney. Tetany involves rapid muscle spasms due to low calcium levels.

  6. Question 6 (NEET 2025)

    NEET 2025MediumHuman Circulatory System
    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 from the options given below:
    1. Option A: A, B and C Only
    2. Option B: A, B, C and D
    3. Option C: A, C and D Only
    4. Option D: A, B and D Only
    Show answer & explanation

    Correct answer: (A) A, B and C Only

    Explanation

    Cardiac activity is regulated by nodal tissue, medulla oblongata, and adrenal medullary hormones. Adrenal cortical hormones are not directly involved.

  7. Question 7 (NEET 2024)

    NEET 2024EasyBiomolecules and Enzymes
    The cofactor of the enzyme carboxypeptidase is:
    1. Option A: Flavin
    2. Option B: Haem
    3. Option C: Zinc
    4. Option D: Niacin
    Show answer & explanation

    Correct answer: (C) Zinc

    Explanation

    Carboxypeptidase is a zinc-containing metalloenzyme, therefore zinc acts as its cofactor.

  8. Question 8 (NEET 2024)

    NEET 2024MediumCardiac Cycle
    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 :
    1. Option A: B-D-E-C-A
    2. Option B: E-A-D-B-C
    3. Option C: E-C-A-D-B
    4. Option D: A-E-C-B-D
    Show answer & explanation

    Correct answer: (C) E-C-A-D-B

    Explanation

    The cardiac impulse originates at the SA node, then passes to the AV node, AV bundle, bundle branches, and finally Purkinje fibres. Hence the correct sequence is E-C-A-D-B.

  9. Question 9 (NEET 2023)

    NEET 2023EasyMineral Nutrition and Physiology
    Which one of the following statements is correct?
    1. Option A: The daily requirement of Mg and Ca in the human body is estimated to be 0.2 - 0.3 g.
    2. Option B: All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor.
    3. Option C: The bone in human body is an inert and unchanging substance.
    4. Option D: Mg plays roles in neuromuscular function and interneuronal transmission.
    Show answer & explanation

    Correct answer: (A) The daily requirement of Mg and Ca in the human body is estimated to be 0.2 - 0.3 g.

    Explanation

    The approximate daily requirement of magnesium and calcium in the human body is around 0.2–0.3 g. ATP-utilizing enzymes generally require Mg²⁺, not Ca²⁺. Bone is a dynamic tissue, and neuromuscular transmission is primarily associated with calcium.

  10. Question 10 (NEET 2023)

    NEET 2023EasyRespiration
    Vital capacity of lung is ________.
    1. Option A: IRV + ERV
    2. Option B: IRV + ERV + TV + RV
    3. Option C: IRV + ERV + TV − RV
    4. Option D: IRV + ERV + TV
    Show answer & explanation

    Correct answer: (D) IRV + ERV + TV

    Explanation

    Vital capacity is the maximum volume of air a person can expel after maximum inspiration and is equal to Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV) + Tidal Volume (TV).

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