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Define vital capacity. What is its significance?

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Functional Residual Capacity (FRC): The volume of air which remains in the lungs after a normal expiration is called Functional Residual Capacity. FRC = ERV + RV.

ERV =1000 to 1100 ml

RV = 1100 to 1200 ml

So, FRC = 2100 to 2300 ml.

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