How does residual volume differ from functional residual capacity?
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The functional residual capacity (FRC) can be defined in multiple ways. FRC is the volume in the lungs at the end of a natural exhalation. However, there is still air left in the lungs. The residual volume (RV) is the amount of air an individual never physiologically expires.
The residual volume functions to keep the alveoli open even after maximum expiration. In healthy lungs, the air that makes up the residual volume allows for continual gas exchange to occur between breaths. The oxygen-depleted residual air is then mixed with newly inhaled air to improve gas exchange at the alveoli.
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