First slide

Mechanism of Breathing

Question

A person breathes in forcibly and then breaths out forcibly. The amount of air exhaled and the amount of air left in his lungs after that exhalation are respectively

Difficult

A

Expiratory capacity and residual volume
B

Vital capacity and functional residual capacity
C

Total lung capacity and residual volume
D

Vital capacity and residual volume

Solution

The maximum volume of air a person can breathe in after a forced expiration is termed vital capacity (IRV+TV+ERV). The volume of air that will remain in the lungs after a forcible expiration is termed residual volume (RV).

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