Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of: Expiratory Reserve Volume, Residual Volume, Inspiratory Reserve Volume, Tidal Volume
Residual Volume
Expiratory Reserve Volume
Tidal Volume
Inspiratory Reserve Volume
Solution:
The volume of air remaining in the lungs even after a forcible expiration is called residual volume. Thus, the correct answer is option B.