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why is inspiratory capacity the sum of TV & IRV?

Dear student,

Inspiratory capacity(IC) which is defined as volume of air that can be inspired after a normal expiration, is given by tidal volume(TV) and inspiratory reserve volume.(IRV).
TV is the amount of air which is normally inhaled by inspiration after completion of a normal inspiration​
IRV is the amount of air which is inhaled by forcible inspiration after completion of a normal inspiration​​.
Therefore, IC includes both TV+ IRV.

Regards.

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tidal volume is the volume of air which we normally breathe in and inspiratory reserve volume is that volume which we forcefully breathe in sometimes
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inspiratory capacity is the total volume of we can breathe in so, it is given by sum of tidal volume and inspiratory reserve volume
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