Question

lo 4.4. what is tidal volume?
amount of air inhaled or exhaled during forced breathing
amount of air inhaled or exhaled during normal breathing
amount of air inhaled or exhaled during exercise
amount of air inhaled or exhaled during deep breathing
amount of air inhaled or exhaled during sleep

Explanation:

Tidal volume is a term in respiratory physiology. It specifically refers to the volume of air that is inhaled or exhaled during normal, quiet breathing. Forced breathing, exercise - related breathing, deep breathing, and sleep - related breathing (which is often a form of normal breathing but the key is the 'normal' descriptor in the definition) are not the standard definitions for tidal volume. The key is the 'normal breathing' aspect which differentiates it from other types of breathing scenarios described in the options.

Answer:

Amount of air inhaled or exhaled during normal breathing