Marcus exhales normally; then, using forced expiration, he exhales as much air as possible. The volume of air still remaining in his lungs is called ________.
A) expiratory reserve volume
B) tidal volume
C) inspiratory reserve volume
D) vital capacity
E) residual volume

Question

Quizplus · Accepted Answer

The volume of air still remaining in the lungs after a forced expiration is known as the residual volume. This is the air volume that cannot be voluntarily expelled, ensuring that gas exchange continues between breaths and helps keep the lungs open.

Marcus Exhales Normally; Then, Using Forced Expiration, He Exhales as Much