Which of the following does not occur during expiration when a person is breathing quietly?
A) the size of the thoracic cavity is reduced.
B) the intra-alveolar pressure becomes greater than atmospheric pressure.
C) air flows out of the lungs.
D) the expiratory muscles contract.
E) intrapleural pressure is less than intra-alveolar pressure.

Question

Quizplus · Accepted Answer

During quiet breathing, expiration is a passive process and does not require the contraction of expiratory muscles. The other choices all occur during expiration when a person is breathing quietly.

Which of the Following Does Not Occur During Expiration When