While having a physical examination, a young male informed his doctor that at ag

His vital capacity (VC) was measured using a spirometer. As he breathed into a handheld device, the speed and volume of air flow was calculated from the output of a pressure transducer. Tidal volume (TV) is the amount of air that moves into and out of the lungs with normal breathing. Inspiratory reserve volume (IRV) is the amount of air that can be forcibly inhaled beyond the tidal volume. The expiratory reserve volume (ERV) is the amount of air that can be evacuated from the lungs over and above a tidal expiration. Residual volume (RV) is the amount of air that remains in the lungs even after the most strenuous expiration. Vital capacity (VC) is the total amount of exchangeable air.