What 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.

Question

Quizplus · Accepted Answer

During quiet expiration, the expiratory muscles (such as the internal intercostals and abdominal muscles) do not contract. The passive recoil of the lungs and chest wall is sufficient to cause air to flow out of the lungs.

What Does NOT Occur During Expiration When a Person Is