3.4 Lung Volumes and Capacities

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Last updated 10:09 PM on 9/30/26
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11 Terms

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Volumes

Amount of air

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Capacities

Combination of volumes that show us our physical limits

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Tidal Volume (TV)

volume of air inhaled/exhaled in a single cycle

  • quiet, rest breathing

  • 7% lung capacity


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Inspiratory Reserve Volume (IRV)

Amount of air inhaled beyond tidal volume


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Expiratory Reserve Volume (ERV)

amount of air forcibly exhaled following passive exhale or resting expiratory volume (REL)

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Residual Volume

air remaining in the lungs after a maximum exhalation

  • lungs are never completely empty


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Total Lung Capacity

volume of air in lungs at end of max inhalation

  • TLC = TV + IRV + ERV + RV


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Vital capacity

Maximum amount of air exhalated after deepest inhalation

  • VC = TV + IRV + ERV

  • measure of respiratory health


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Inspiratory Capacity

Maximum volume of air inhaled from REL

  • IC = TV + IRV


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Functional Residual Capacity

quantity of air in lungs at REL

  • FRC = ERV + RV


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Resting expiratory level (REL)

Level of equilibrium between two opposing forces, rib cage to expand and lungs to collapse