My doubt is:"why is exchange of gases in lungs not interrupted during expiration?" Please explain.
The residual volume (RV) is the amount of air that is left after expiratory reserve volume is exhaled. The lungs are never completely empty: There is always some air left in the lungs after a maximal exhalation. ... The inspiratory capacity (IC) is the amount of air that can be inhaled after the end of a normal expiration a