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Volumes & Capacities

Volumes and Capacties of the Respiratory System

Volume/Capacity Name Definition
Tidal Volume (TV) volume of air exchanged in one cycle of respiration
Inspiratory Reserve Volume (IRV) volume of air that can be inhaled after tidal respiration
Expiratory Reserve Volume (ERV) volume of air that can be expired following passive, tidal expiration
Resting Lung Volume also known as expiratory reserve volume; volume of air that can be expired following passive, tidal expiration
Residual Volume (RV) volume of air remaining in the lungs after a maximum exhalation
Dead Air volume of air within the conducting passageways that cannot be involved in gas exchange (included as a component of residual volume)
Vital Capacity (VC) the volume of air that can be inhaled following a maximal exhalation
Vital Capacity (VC) includes inspiratory reserve volume, tidal volume, and expiratory reserve volume ( = IRV + TV + ERV)
Functional Residual Capacity the volume of air in the body at the ends of passive exhalation
Functional Residual Capacity includes expiratory reserve and residual volumes ( = ERV + RV)
Total Lung Capacity (TLC) the sum of inspiratory reserve volume, tidal volume, expiratory reserve volume and residual volume ( = IC + FRC)
Inspiratory Capacity (IC) the maximum inspiratory volume possible after tidal expiration ( = TV + IRV)
Created by: sullivancl