what is frv
Functional Residual Volume (FRV) or Functional Residual Capacity (FRC) is the volume of air that remains in the lungs after normal breath or expiration. 
. It is about 2200 − 2300 mL.
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what is frv
Functional Residual Volume (FRV) or Functional Residual Capacity (FRC) is the volume of air that remains in the lungs after normal breath or expiration. . It is about 2200 − 2300 mL.