Lung Volumes and Capacities

The amount of air that ...
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Lung Volumes and Capacities


The amount of air that moves in and out of the lungs during inspiration and expiration with quiet breathing is called the tidal volume (TV). The air inspired with maximal inspiratory effort in excess of the tidal volume is the inspiratory reserve volume (IRV). The expiratory reserve volume (ERV) is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume. The residual volume (RV) is the volume of air remaining in the lungs after maximal exhalation.


The inspiratory capacity (IC) is the amount of air that can be inspired from the end-expiratory level (IRV + TV). The functional residual capacity (FRC) represents the volume of air remaining in the lungs after expiration of a normal breath (ERV + RV). The vital capacity (VC) is the maximum volume exhaled after maximum inhalation (IRV + TV + ERV). The total lung capacity (TLC), about 6 L, is the maximum amount of air that can fill the lungs (IRV + TV + ERV + RV).


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Contributed by

Dr. Gerald Diaz
@GeraldMD
Board Certified Internal Medicine Hospitalist, GrepMed Editor in Chief πŸ‡΅πŸ‡­ πŸ‡ΊπŸ‡Έ - Sign up for an account to like, bookmark and upload images to contribute to our community platform. Follow us on IG:  https://www.instagram.com/grepmed/ | Twitter: https://twitter.com/grepmeded/
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