Mechanism of breathing — Breathing and Gaseous Exchange NEET Questions 2026

Sample Questions — Mechanism of breathing

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MCQ

Assertion (A): Intra-pulmonary pressure increases during expiration. Reason (R): Pulmonary volume increases during expiration.

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

✅ Correct Answer: C

Pulmonary volume decreases during expiration, not increases.

MCQ

How do the external intercostal muscles contribute to breathing?

A. They lift the diaphragm upwards
B. They lift the ribs and sternum
C. They compress the lungs
D. They reduce lung volume

✅ Correct Answer: B

External intercostals help expand the thoracic cavity by lifting ribs and sternum.

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MCQ

What is the approximate value of Inspiratory Reserve Volume (IRV)?

A. 500–800 mL
B. 1000–1100 mL
C. 2500–3000 mL
D. 1100–1200 mL

✅ Correct Answer: C

IRV is the additional volume inhaled forcefully.

MCQ

Assertion (A): Residual volume allows lungs to continue gas exchange even after forceful expiration. Reason (R): Residual volume maintains inflation of alveoli.

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

✅ Correct Answer: A

Residual volume keeps alveoli inflated, enabling uninterrupted gas exchange even during deep expiration.

MCQ

The strength of inspiration and expiration can be increased with help of:

A. Cardiac muscles
B. Abdominal muscles
C. Facial muscles
D. Cerebral cortex

✅ Correct Answer: B

Accessory muscles help during forceful breathing.

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Sample Questions — Mechanism of breathing

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