Key Terms - Displacement

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Last updated 4:12 AM on 9/28/26
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6 Terms

1
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Inspiratory Reserve Volume (IRV)

Volume of air that can be forcefully inspired following a normal, quiet inspiration.

Often used by singers, public speakers.

2
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Expiratory Reserve Volume (ERV)

Volume of air that can be forcefully expired a following a normal, quiet expiration.

Used when trying to finish a long sentence in one breath.

3
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Tidal Volume (TV)

The volume of air we breathe in and out during a cycle of respiration.

Changes quickly with physical exertion (ex: 600 - 750 ml (quiet breathing) to 2030 ml (physical activity) in males).

4
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Residual Volume (RV)

Even when you have exhausted your expiratory reserve volume, you still have left a bit of air, and this is your residual volume.

Usually makes up about 20% of your TLC.

5
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Vital Capacity (VC)

The maximum amount of air that a person can exhale after having inhaled as deeply as possible.

TV + IRV + ERV = VC

Note: it does not include RV (not under our control).

6
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Total Lung Capacity (TLC)

The amount of air in the lungs after maximal inhalation.

The total amount of air the lungs can hold.

TV + IRV = ERV = RV = TLC

VC + RV = TLC