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NEET2019ZoologyBreathing and Exchange of GasesActual

Select the correct statement.

Options

  1. AExpiration occurs due to external intercostal muscles
  2. BIntrapulmonary pressure is lower than the atmospheric pressure during inspiration
  3. CInspiration occurs when atmospheric pressure is less than intrapulmonary pressure
  4. DExpiration is initiated due to contraction of diaphragm

Correct answer

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

Step-by-step solution

Statement (b) is correct as intrapulmonary pressure is lower than the atmospheric pressure during inspiration. Other statements can be corrected as (a) Inspiration occurs due to external intercoastal muscles. (c) Inspiration occurs when atmospheric pressure is more than intrapulmonary pressure. (d) Inspiration is initiated due to contraction of diaphragm.

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