Physiology The forced vital capacity is A The amount of air that normally moves into (or out of) the lung with each respiration. B The amount of air that enters the lung but does not participate in gas exchange. C The largest amount of air expired after maximal inspiratory effort. D The largest amount of gas that can be moved into and out of the lungs in 1 min. 💡 Explanation The forced vital capacity is ✓ Correct Answer: C. The largest amount of air expired after maximal inspiratory effort.