Q.
What happens when the intrapulmonary pressure is less than atmospheric pressure?
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NTA AbhyasNTA Abhyas 2020Breathing and Exchange of Gases
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Solution:
Intrapleural pressure is the pressure of the air within the pleural cavity, between the visceral and parietal pleurae.
Air flows into the lungs largely due to a difference in pressure; atmospheric pressure is greater than intra-alveolar pressure, and intra-alveolar pressure is greater than intrapleural pressure. Air flows out of the lungs during expiration based on the same principle; pressure within the lungs becomes greater than the atmospheric pressure.