What happens 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) The lung collapses.

Question

Quizplus · Accepted Answer

When intra-alveolar pressure becomes greater than atmospheric pressure, air will flow out of the lungs due to the pressure gradient. This is known as expiration or exhalation, and is a normal part of the breathing process.

What Happens When Intra-Alveolar Pressure Becomes Greater Than Atmospheric Pressure