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Residual volume is the amount of air remaining in the lungs after a maximal exhalation. It cannot be expelled and ensures that the lungs do not collapse.
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Tidal Volume: The amount of air inhaled or exhaled during normal breathing.
Total Lung Capacity: The maximum amount of air the lungs can hold after a maximum inhalation.
Forced Vital Capacity: The total amount of air that can be forcibly exhaled after full inhalation.