In relaxed state, chest wall and lung recoil are balanced at:

Ans: D. FRC(Ref: Ganong 25/e p629, 24/e p629; Guyton 13/e p502)In relaxed state, chest wall and lung recoil are balanced at functional residual capacity (FRC).Compliance is developed due to the tendency for tissue to resume its original position after an applied force has been removed.After an expiration during quiet breathing (e.g., at the FRC), the lungs have a tendency to collapse and the chest wall has a tendency to expand.