The amount of air inhaled or exhaled during normal breathing?

• A. Vital Capacity
• B. Tidal Volume
• C. Residual Volume
• D. Inspiratory Reserve Volume

Answer: (B)

The amount of air moved in or out with each normal breath is tidal volume. It reflects the air you inhale and exhale during quiet breathing at rest, typically about 500 mL in an average adult, though it changes with body size and activity. This is different from vital capacity, which is the total amount you can exhale after a full, maximal inhalation; residual volume, the air that remains in the lungs after a full exhalation; and inspiratory reserve volume, the extra air you can inhale beyond a normal breath. So for everyday breathing, tidal volume is the correct term.