When intra-alveolar pressure becomes greater than atmospheric pressure
A) Air will flow out of the lungs.
B) Air will flow into the lungs.
C) There will be no air flow.
D) Air will flow out of the lungs or there will be no air flow.
E) None of these.

Question

Quizplus · Accepted Answer

Air moves from an area of high pressure to an area of low pressure. When intra-alveolar pressure becomes greater than atmospheric pressure, the pressure gradient favors air movement out of the lungs, causing exhalation.

When Intra-Alveolar Pressure Becomes Greater Than Atmospheric Pressure