Final answer:
Tidal volume (TV) refers to the amount of air inspired and expired during normal breathing, and it is approximately 500 mL.
Step-by-step explanation:
Tidal volume (TV) refers to the amount of air that is inspired and expired during normal breathing. It is approximately 500 milliliters (ml) of air.
Total lung capacity (TLC), on the other hand, is the sum of various lung volumes, including the residual volume (RV).
Therefore, the statement that normal quiet breathing, known as tidal volume, is around 500 mL of air is true.