Question

what is functional resdual volume? how it is useful? please it's very very urgent​

Answer 1

Answer:

Functional Residual Capacity (FRC) is the volume of air present in the lungs at the end of passive expiration. At FRC, the opposing elastic recoil forces of the lungs and chest wall are in equilibrium and there is no exertion by the diaphragm or other respiratory muscles.

Explanation:

Answer 2

Answer:

Volume of air remaining in the lungs even after a forcible Expiration.

This averages 1100ml to 1200ml.