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) both (a) and (b) above.
E) none of these answers.

Question

Quizplus · Accepted Answer

When intra-alveolar pressure (pressure inside the lungs) becomes greater than atmospheric pressure (pressure outside the body), air will flow out of the lungs. This is called expiration, and it is part of the process of breathing.

When Intra-Alveolar Pressure Becomes Greater Than Atmospheric Pressure