Q144 / 180 · NEET 2019 (Odisha) · Zoology

Select the correct statement.

  • A
    Expiration occurs due to external intercostal muscles
  • Correct answer
    B
    Intrapulmonary pressure is lower than the atmospheric pressure during inspiration
  • C
    Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure
  • D
    Expiration is initiated due to contraction of diaphragm

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.

Hence, the correct answer is option: 'B'.

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