Final answer:
The total volume of air that can be exhaled after taking a maximum inhalation is called the expiratory reserve volume (ERV). ERV is the additional volume of air that can be exhaled forcefully after a normal exhalation.
Step-by-step explanation:
The total volume of air that can be exhaled after taking a maximum inhalation is called the expiratory reserve volume (ERV). ERV refers to the additional volume of air that can be exhaled forcefully after a normal exhalation. This is the volume of air that is still present in the lungs even after exhaling as much as possible.