Final answer:
The volume of air forcefully expelled from the lungs after a normal exhalation is known as the expiratory reserve volume (ERV).
Step-by-step explanation:
The volume of air forcefully expelled from the lungs following a normal exhalation is called the expiratory reserve volume (ERV). This is the extra air that you can exhale forcibly after a normal, quiet exhalation. For men, this volume can be up to 1200 milliliters. The residual volume (RV) is the air remaining in the lungs after exhaling as much as possible, which prevents the alveoli from collapsing, making breathing easier. The tidal volume (TV) is the air exchanged during normal breathing, about 500 milliliters. On the other hand, the inspiratory reserve volume (IRV) is the additional air that can be inhaled after a normal inhalation.