Which muscle contracts during forced expiration?
A) internal oblique
B) serratus anterior
C) sternocleidomastoid
D) pectoralis major

Question

Quizplus · Accepted Answer

The internal oblique muscle is a part of the abdominal wall and contracts during forced expiration to decrease the volume of the thoracic cavity, expelling air out of the lungs. The other muscles listed, such as the serratus anterior, sternocleidomastoid, and pectoralis major, are not directly involved in the process of forced expiration.

Which Muscle Contracts During Forced Expiration