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

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Find the wrong statement out with respect to oesophagus.

A. Thin, long tube B. Extends posteriorly C. Passes through diaphragm D. opens into thorax

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Explanation

NCERT page number 259.

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One of the factors required for the maturation of erythrocytes is

vitamin - D

vitamin - A

vitamin - B₁₂

vitamin - C

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Explanation

(c) Vitamin-B₁₂ (cobalamin) promotes DNA synthesis, maturation of erythrocytes and myelin formation. Vitamin-D (calciferol), It is necessary for the formation of healthy bones and teeth.

Vitamin-A (retinol), It is necessary for proper body growth and night vision. Vitamin-C (ascorbic acid), It helps in wound healing, blood formation and absorption of iron.

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Oxalates and citrates are used as anticoagulants in stored blood because they:

Chelate calcium ions

Act as competitive inhibitors of vitamin K

Potentiate anti-thrombin III

Activate heparin

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Explanation

1. Each step of blood clotting requires the presence of calcium ions. Non-availability due to chelation will lead to their anti-coagulant effect.

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The inter-atrial septum in the human heart can be best described as:

A thin muscular wall

A thick muscular wall

A thin fibrous tissue

A thick fibrous tissue

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Explanation

Answer: 1

Read page 283, XI NCERT

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The sino-atrial node is the normal pacemaker of the human heart because:

It is located in the right atrium

It is the only part of the conducting system that can generate impulse

It can generate the maximum number of action potentials in the conducting system

It produces action potentials that are more in size than the other parts of the conducting system.

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Explanation

Answer 3. Read page 284, XI NCERT.

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What percentage of ventricular filling is achieved by atrial contraction?

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Explanation

Answer 1. Read page 284, XI NCERT

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The second heart sound during the cardiac cycle is produced by the:

Simultaneous opening of the atrioventricular valves

Simultaneous closure of the atrioventricular valves

Simultaneous opening of the semilunar valves

Simultaneous closure of the semilunar valves

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Explanation

Answer 4. Read page 285, XI NCERT

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In a surface ECG the QRS complex represents:

Atrial depolarization

Atrial repolarization

Ventricular depolrization

Ventricular repolarization

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Explanation

Answer 3. Read page 286, XI NCERT.

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A common symptom produced by myocardial ischemia is:

Hypertension

Vertigo

Angina

Hyperventilation

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Explanation

3. Read page 288, XI NCERT

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A decrease in plasma albumin levels is likely to affect:

Clot formation

Oxygenation of hemoglobin

Osmotic balance

Immune functions

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Explanation

Answer 3. Read page 279, XI NCERT

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