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  4. The inspiratory reserve volume + tidal volume + expiratory reserve volume is the same as

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Q. The inspiratory reserve volume $+$ tidal volume $+$ expiratory reserve volume is the same as

AMUAMU 2013Breathing and Exchange of Gases

Solution:

Inspiratory reserve volume $(IRV) +$ tidal volume $(TV) +$ expiratory reserve volume $(ERV)$ represents vital capacity $(VC)$. Now, inspiratory capacity is the total volume of air that can be inhaled after a normal expiration.* It includes tidal volume and inspiratory reserve volume i.e., $IC = TV + IRV$. Thus, option (a) is correct which says that vital capacity i.e., $IRV + TV + ERV = IC + ERV$.