Breathing and Exchange of GasesHard

Question

The quantity 150 mL in the respiratory volumes of a normal human adult refers to

Options

A.maximun air that can be breathed in and breathed out
B.residual volume
C.expiratory reserve volume
D.total lung capacity

Solution

Residual air is the volume of air that remains in the lungs after the most forceful expiration. It equals to 1500 mL. Residual air mostly occurs in alv eoli. Maximum air that can be breathed in and breathed out is vital capacity 3500 - 4500 mL). while the air that can be expired over and above the tidal air by most forceful expiration is the expiratory reserve volume (1200mL).

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