Final answer:
The term for the extra amount of air exhaled after a normal exhalation is Expiratory Reserve Volume (ERV), different from Tidal Volume or Residual Volume.
Step-by-step explanation:
The term for the extra amount of air actively exhaled after a normal exhalation is Expiratory Reserve Volume (ERV). This is the volume of air that can be forcibly exhaled after the completion of a normal, passive exhalation. In an average adult male, the ERV can be up to 1200 milliliters. This is different from the Tidal Volume (TV), which is the amount of air inhaled or exhaled during normal breathing, and different from the Residual Volume (RV), which is the amount of air that remains in the lungs after a forced exhalation to keep the alveoli open.