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Asked by Nishant Last Modified
Answer After a normal exhalation, when the individual is at rest, there is still a certain volume of air left in the lungs. This volume is known as the Functional Residual Capacity (FRC).
Functional Residual Capacity (FRC) is the volume of air remaining in the lungs after a normal tidal volume exhalation. It represents the equilibrium point between the outward recoil of the chest wall and the inward recoil of the lungs, occurring at the end of a normal breath when there is no further effort to exhale or inhale.
The typical value for Functional Residual Capacity (FRC) in adults is approximately 2.3 to 2.5 liters. This volume includes the Expiratory Reserve Volume (ERV) and the Residual Volume (RV).
Expiratory Reserve Volume (ERV) is the volume of air that can be forcibly exhaled after a normal exhalation. It is usually around 1.0 to 1.5 liters.
Residual Volume (RV) is the volume of air that remains in the lungs after maximal exhalation. It cannot be measured directly using spirometry and is estimated to be approximately 1.2 to 1.5 liters in healthy adults.
Therefore, after a normal exhalation, the volume of air remaining in the lungs, represented by the Functional Residual Capacity (FRC), is approximately 2.3 to 2.5 liters, comprising both the Expiratory Reserve Volume (ERV) and the Residual Volume (RV).
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