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  4. The vital capacity of lungs is equal to

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Q. The vital capacity of lungs is equal to

UP CPMTUP CPMT 2012

Solution:

The vital capacity equals the inspiratory reserve volume $(IRV)$ plus the tidal volume $(TV)$ plus the expiratory reserve volume $(ERV)$. This is the maximum amount of air a person can expel from the lungs after first filling the lungs to their maximum extent and then expiring to the maximum extent (about $4600$ milliliters).