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  4. If expiratory reserve volume is 1100 mL, residual volume is 1200 mL and tidal volume is 500 mL, what shall be the functional residual capacity?

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Q. If expiratory reserve volume is $1100 \,mL$, residual volume is $1200\, mL$ and tidal volume is $500 \,mL$, what shall be the functional residual capacity?

Breathing and Exchange of Gases

Solution:

Functional residual capacity is the volume of air that remain in the lungs after normal expiration.
$FRC = RV + ERV$
$=1100+1200=2300\,mL .$