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easyMCQNEET 20192026BIOLOGY
1 mark

Select the correct statement regarding breathing:

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

Solution & Step-by-step Explanation

Getty Images Explore Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This means the intrapulmonary pressure is lower than the atmospheric pressure, drawing air into the lungs.

Practice this question

Try it yourself before checking the explanation above.

Select the correct statement regarding breathing:
A
Expiration occurs due to external intercostal muscles.
B
Intrapulmonary pressure is lower than atmospheric pressure during inspiration.
C
Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.
D
Expiration is initiated due to the contraction of the diaphragm.

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human physiologybreathing and exchange of gases

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