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Biology · PYQ NEET UG 2019(2)

हिन्दी

Select the CORRECT statement.

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

Correct answer · Option 3

Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

Explanation

During inspiration, contraction of diaphragm and intercostal muscles increases thoracic volume, decreasing intrapulmonary pressure below atmospheric pressure.
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