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Class XI · Biology

Body Fluids and Circulation: NEET MCQ practice

261 practice questions on Body Fluids and Circulation, including 28 from past NEET papers, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

261

Practice questions

187

Easy

74

Medium

0

Hard

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What Body Fluids and Circulation covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Composition of blood, blood groups, coagulation of blood
  • Composition of lymph and its function
  • Human circulatory system; structure of human heart and blood vessels
  • Cardiac cycle, cardiac output, ECG; double circulation; regulation of cardiac activity
  • Disorders- hypertension, coronary artery disease, angina pectoris, heart failure

Past NEET questions on Body Fluids and Circulation

Try each one, then open the answer and explanation.

Question 1 · NEET 2025

What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog?

  1. A.Aorta
  2. B.Pulmonary artery
  3. C.Pulmonary vein
  4. D.Vena cava
Show answer

Answer: D. Vena cava

In frogs, systemic veins return deoxygenated blood to the heart. The major systemic vein is the 'Venae cavae' (singular Vena cava), which empties into the sinus venosus. This matches the general vertebrate pattern.

Question 2 · NEET 2025

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. A.A, B and C Only.
  2. B.A, B, C and D
  3. C.A, C and D Only
  4. D.A, B and D Only
Show answer

Answer: A. A, B and C Only.

Cardiac activity is regulated intrinsically by nodal tissue (A), extrinsically by autonomic neural centre in medulla oblongata (B), and hormones like adrenaline from adrenal medulla (C). Adrenal cortical hormones (D) are not directly involved.

Question 3 · NEET 2024

A person with blood group ARh- can receive the blood transfusion from which of the following types? A. BRh B. ABRh− C. ORh− D. ARh− E. ARh+ Choose the correct answer from the options given below:

  1. A.D and E only
  2. B.D only
  3. C.A and B only
  4. D.C and D only
Show answer

Answer: D. C and D only

Recipient is Rh- so cannot receive Rh+ blood (E excluded). They are A type, so can receive O, A (same antigen). O is universal donor, but Rh must match Rh-. Acceptable: C (ORh−) and D (ARh−).

Question 4 · NEET 2024

Open Circulatory system is present in:

  1. A.Palaemon, Nereis, Balanoglossus
  2. B.Hirudinaria, Bombyx, Salpa
  3. C.Anopheles, Limax, Limulus
  4. D.Pheretima, Musca, Pila
Show answer

Answer: C. Anopheles, Limax, Limulus

Open circulatory system lacks capillaries; hemolymph directly bathes tissues. It is typical of arthropods & some mollusks. Checking: (A) Palaemon (arthropod) OK, Nereis (annelid, closed) no, Balanoglossus (hemichordate, open? some say open-like) but mismatch. (B) Hirudinaria (leeches, closed) no. (C) Anopheles (arthropod) OK, Limax (mollusk) OK, Limulus (arthropod) OK – all open. (D) Pheretima (earthworm, closed) no.

Question 5 · NEET 2024

'Lub' sound of Heart is caused by the... ⁡

  1. A.closure of the semilunar valves
  2. B.opening of tricuspid and bicuspid valves
  3. C.opening of the semilunar valves
  4. D.closure of the tricuspid and bicuspid valves SECTION-B
Show answer

Answer: D. closure of the tricuspid and bicuspid valves SECTION-B

The 'lub' (first heart sound, S1) occurs at the beginning of systole due to the simultaneous closure of the atrioventricular valves: tricuspid and bicuspid (mitral) valves.

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