Question

After forceful inspiration, the amount of air that can be breathed out by maximum forced expiration is equal to.

• A. Inspiratory Reserve Volume(IRV) $+$ Expiratory Reserve Volume (ERV) $+$ Tidal Volume (TV)$+$ Residual Volume(RV)
• B. IRV $+$ RV $+$ ERV
• C. IRV $+$ TV $+$ ERV
• D. TV $+$ RV $+$ ERV

Answer 1

The correct option is C IRV $+$ TV $+$ ERV

Inspiratory reserve volume (IRV) is the maximum volume that can be inhaled after a normal inhalation. Expiratory reserve volume (ERV) is the maximum volume that can be exhaled after a normal exhalation. Tidal volume (TV) is the normal resting respiration. Residual volume (RV) is the amount of air left in the lungs after full exhalation. The inspiratory capacity (IC) is the total amount of air that can be inhaled. It is the total of tidal volume (TV) and inspiratory reserve volume (IRV). Vital Capacity (VC) is the maximum amount of air that can be breathed in after forced expiration or the maximum amount of air that can be breathed out after forced inspiration. It is the total of tidal volume (TV), inspiratory reserve volume (IRV), and expiratory reserve volume (ERV). Functional residual capacity (FRC) is the amount of air remaining in the lungs at the end of a normal exhalation. It is the total of Expiratory reserve volume (ERV) and residual volume (RV). The total lung capacity (TLC) is the total of all lung volumes, that is TV + IRV + ERV + RV.

Thus, the correct answer is option C.