Question

Mr Smith 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. expriatory reserve volume
B. tidal volume
C. inspiratory reserve volume
D. vital capacity
E. residual volume

Answer 1

The volume of air still remaining in the lungs after forced expiration is called residual volume.

Step-by-step explanation:

The volume of air still remaining in the lungs after forced expiration is called residual volume. Residual volume is the amount of air that is left in the lungs after expelling the expiratory reserve volume. It prevents the alveoli from collapsing and plays an important role in preventing large fluctuations in respiratory gases such as oxygen and carbon dioxide.

The volume of air still remaining in Mr. Smith's lungs after he uses forced expiration to exhale as much air as possible is called the residual volume. This is because residual volume (RV) is defined as the air that remains in the lungs after a person has exhaled as much as possible, and it prevents the alveoli from collapsing, making breathing easier overall. Other respiratory volumes include tidal volume, inspiratory reserve volume, and expiratory reserve volume, but they do not describe the air remaining after maximal exhalation.