Question

What is the equation for functional residual capacity?

Answer 1

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. FRC is the sum of Expiratory Reserve Volume (ERV) and ResidualVolume (RV) and measures approximately 2400 mL in an 80 kg, average-sized male.

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