NEET Body Fluids and Circulation PYQ practice sheet

16 previous-year NEET Zoology questions from Body Fluids and Circulation, newest papers first. Body Fluids and Circulation carries 18 of the Zoology questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

Practise all 16 online

1.
RE-NEET 2026
The number of action potentials generated by sino-atrial node (SAN) in a healthy human is _______ per minute.
- (A)
  120 - 140
- (B)
  100 - 110
- (C)
  70 - 75
- (D)
  28 - 30
2.
RE-NEET 2026
Which of the following statements is incorrect?
- (A)
  Fibrin is produced from fibrinogen
- (B)
  Blood coagulates in response to an injury
- (C)
  Blood clot consists of fibrins
- (D)
  Fibrinogen is produced from fibrin
3.
RE-NEET 2026
The opening between the right atrium and the right ventricle is guarded by _________.
- (A)
  sino-atrial node
- (B)
  semilunar valve
- (C)
  tricuspid valve
- (D)
  bicuspid valve
4.
NEET 2026
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?
- (A)
  160 - 240/cu mm and 1600 - 2000/cu mm respectively
- (B)
  300 - 500/cu mm and 500 - 700/cu mm respectively
- (C)
  300 - 500/cu mm and 1200 - 1500/cu mm respectively
- (D)
  100 - 120/cu mm and 160 - 200/cu mm respectively
5.
NEET 2026
Select the incorrect statement with reference to Rh grouping. A. Erythroblastosis foetalis is a condition observed having foetus with Rh -ve blood and mother with Rh +ve blood. B. Rh antigen is observed on RBCs in the majority of human beings. C. Before blood transfusion, Rh group should also be matched. D. Rh incompatibility is observed when a pregnant mother is Rh -ve and the foetus is Rh +ve. E. Erythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the mother immediately after the delivery of the second child. Choose the answer from the options given below:
- (A)
  C and D only
- (B)
  A and B only
- (C)
  B and C only
- (D)
  A and E only
6.
NEET 2024
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
7.
NEET 2024
Match List I with List II: List-I: A. P wave, B. QRS complex, C. T wave, D. T-P gap List-II: I. Heart muscles are electrically silent, II. Depolarisation of ventricles, III. Depolarisation of atria, IV. Repolarisation of ventricles Choose the correct answer from the options given below:
- (A)
  A-IV, B-II, C-I, D-III
- (B)
  A-III, B-II, C-IV, D-I
- (C)
  A-I, B-III, C-IV, D-II
- (D)
  A-II, B-III, C-I, D-IV
8.
NEET 2023
Match List I with List II. | List I | List II | |---|---| | A. P-wave | I. Beginning of systole | | B. Q-wave | II. Repolarisation of ventricles | | C. QRS complex | III. Depolarisation of atria | | D. T-wave | IV. Depolarisation of ventricles | Choose the correct answer from the options given below:
- (A)
  A-I, B-II, C-III, D-IV
- (B)
  A-III, B-I, C-IV, D-II
- (C)
  A-IV, B-III, C-II, D-I
- (D)
  A-II, B-IV, C-I, D-III
9.
NEET 2023
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 Choose the correct answer from the options given below:
- (A)
  A and B only
- (B)
  D and E only
- (C)
  C and E only
- (D)
  B and C only
10.
NEET 2022
Given below are two statements: Statement I: The coagulum is formed of a network of threads called thrombins. Statement II: Spleen is the graveyard of erythrocytes. In the light of the above statements, choose the correct answer from the options given below:
- (A)
  Statement I is incorrect but Statement II is correct
- (B)
  Both Statement I and Statement II are correct
- (C)
  Both Statement I and Statement II are incorrect
- (D)
  Statement I is correct but Statement II is incorrect
11.
NEET 2022
Under normal physiological conditions, in a human being, every 100 ml of oxygenated blood can deliver ______ ml of $\mathrm{O_2}$ to the tissues.
- (A)
  10 ml
- (B)
  2 ml
- (C)
  5 ml
- (D)
  4 ml
12.
NEET 2022
Which one of the following statements is correct?
- (A)
  Increased ventricular pressure causes closing of semilunar valves.
- (B)
  The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction.
- (C)
  The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria.
- (D)
  Blood moves freely from atrium to the ventricle during joint diastole.
13.
NEET 2021
Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins ?
- (A)
  Epinephrine
- (B)
  Thrombin
- (C)
  Thrombokinase
- (D)
  Renin
14.
NEET 2021
Persons with 'AB' blood group are called as "Universal recipients". This is due to :
- (A)
  Presence of antibodies, anti-A and anti-B, on RBCs
- (B)
  Absence of antigens A and B on the surface of RBCs
- (C)
  Absence of antibodies, anti-A and anti-B, in plasma
- (D)
  Absence of antigens A and B in plasma
15.
NEET 2020
Match the following columns and select the correct option.
- (A)
  (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
- (B)
  (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
- (C)
  (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
- (D)
  (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
16.
NEET 2020
The QRS complex in a standard ECG represents :
- (A)
  Repolarisation of auricles
- (B)
  Depolarisation of auricles
- (C)
  Depolarisation of ventricles
- (D)
  Repolarisation of ventricles

Answer key

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