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NEET 2020 · BiologyPrevious Year Question

Select the correct statement.

Answer: (B) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.. Answer: (b) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

  1. A.Expiration occurs due to external intercostal muscles
  2. B.Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.✓
  3. C.Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.
  4. D.Expiration is initiated due to contraction of diaphragm.

Correct Answer

(B) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

Solution & Explanation

Answer: (b) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration. Solution: Inspiration occurs only when intra-pulmonary pressure falls below atmospheric pressure, drawing air in — so (b) is correct. Expiration is caused by relaxation of diaphragm and intercostals (not external intercostals contracting), and inspiration (not expiration) is initiated by diaphragm contraction, so the other statements are false. NCERT: Ch 14, p.185, line 37 — "Inspiration can occur if the pressure within the lungs... is less than the atmospheric pressure"

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