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# Lung Volumes and Capacities (1 of 2) ## Lung Volumes * **Tidal volume:** Additional amount of air inhaled at the end of tidal inspiration. * **Inspiratory reserve volume:** Additional amount of air that can be inhaled after a tidal inspiration. * **Expiratory reserve volume:** Additional a...

# Lung Volumes and Capacities (1 of 2) ## Lung Volumes * **Tidal volume:** Additional amount of air inhaled at the end of tidal inspiration. * **Inspiratory reserve volume:** Additional amount of air that can be inhaled after a tidal inspiration. * **Expiratory reserve volume:** Additional amount of air that can be exhaled after a tidal expiration. * **Residual volume:** Amount of air left in the lungs after a forced expiration; cannot be measured. ## Lung Capacities * **Total lung capacity:** Cannot be measured. * **Inspiratory capacity:** Additional amount of air that can be inhaled at the end of a tidal inspiration. * **Functional residual capacity (FRC):** Determined by measuring the amount of air remaining in the lungs after a tidal expiration; cannot be directly measured. * **Vital capacity:** Maximum amount of air that can be inhaled and exhaled through one single respiratory cycle.