why do we include ERV+RV in FRC. because FRC is volume which is inside reamining but ERV is expired then why we include ERV in FRC
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Please find below the solution to the asked query
FRC includes the volume of air that remains in lungs after normal expiration.
Expiratory Reserve Volume (ERV) is the additional volume of air a person can expire by forceful expiration. This is about 1000-1100mL. When we do forcible expiration, the ERV gets less from the FRC.
Residual Volume (RV) is the volume of air remaining in the lungs even after forceful expiration. It is about 1100 − 1200 mL. Hence this is the volume that remains in lungs after removing ERV from FRC.
Suppose RV = 1200 mL and ERV = 1100 mL, then FRC will be = 1200 + 1100 = 2300mL.
Therefore we can say that volume of air remaining in lungs after normal expiration =2300mL and is called FRC.
ERV is the volume of air removed from 2300mL after forcible expiration and is = 1100mL and RV = FRC - ERV = 1200mL.
Hence, we add ERV and RV = 1100 + 1200 = 2300mL.
Hope this information will clear your doubts about the topic.
Regard
Please find below the solution to the asked query
FRC includes the volume of air that remains in lungs after normal expiration.
Expiratory Reserve Volume (ERV) is the additional volume of air a person can expire by forceful expiration. This is about 1000-1100mL. When we do forcible expiration, the ERV gets less from the FRC.
Residual Volume (RV) is the volume of air remaining in the lungs even after forceful expiration. It is about 1100 − 1200 mL. Hence this is the volume that remains in lungs after removing ERV from FRC.
Suppose RV = 1200 mL and ERV = 1100 mL, then FRC will be = 1200 + 1100 = 2300mL.
Therefore we can say that volume of air remaining in lungs after normal expiration =2300mL and is called FRC.
ERV is the volume of air removed from 2300mL after forcible expiration and is = 1100mL and RV = FRC - ERV = 1200mL.
Hence, we add ERV and RV = 1100 + 1200 = 2300mL.
Hope this information will clear your doubts about the topic.
Regard