False about functional residual capacity: (LQ, PGI Nov 10)
|A||During GA falls by 20%|
|B||It is expiratory reserve volume (ERV) + residual volume (RV)|
|C||It is tidal volume expiratory reserve volume|
|D||Normal is 2.5 liters|
It is tidal volume expiratory reserve volume
FRC is the volume of gas in lungs after normal expiration so it is ERV + RV. Normal is 2.4 to 2.6 liters.
During GA, FRC decreases by 15-20%.