11 out of 15
Tidal volume is: (DNB Dec-2009)
|A||Total vital capacity + RV|
|B||Functional residual capacity - RV|
|D||Inspiratory capacity — inspiratory reserve volume|
Ans. D Inspiratory capacity — inspiratory reserve volume
- The amount of air that moves into the lungs with each inspiration (or that moves out with each expiration) is known as the tidal volume.
- The air inspired with a maximal inspiratory effort in excess of the tidal volume is the inspiratory reserve volume.
- The volume expelled by an active expiratory effort after passive expiration is the expiratory reserve volume, and the air ‘left’ in the lungs after a maximal expiratory effort is the residual volume.
- The space in the conducting zone of the airways occupied by the gas that does not exchange with blood in the pulmonary vessels is the respiratory dead space.
- The vital capacity is the largest amount of air that can be expired after a inspiratory effort. The vital capacity equals the inspiratory reserve volume plus the tidal volume plus expiratory reserve volume.