NEET 2017 · BiologyPrevious Year Question
Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of :
Answer: (A) Residual Volume. Answer: (a) Residual Volume Solution: Even after the most forceful expiration, some air always remains inside the alveoli — this is the Residual Volume.
- A.Residual Volume✓
- B.Inspiratory Reserve Volume
- C.Tidal Volume
- D.Expiratory Reserve Volume
Correct Answer
(A) Residual Volume
Solution & Explanation
Answer: (a) Residual Volume Solution: Even after the most forceful expiration, some air always remains inside the alveoli — this is the Residual Volume. This trapped air keeps the alveoli inflated so they do not collapse. The other options (IRV, TV, ERV) are all volumes that can be moved in or out, not the air left behind. NCERT: Ch 14, p.187, line 3 — "Volume of air remaining in the lungs even after a forcible expiration"
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