Which term is used to describe the amount of air moved per breath during normal breathing?

Which term is used to describe the amount of air moved per breath during normal breathing?

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

Answer: (C)

The amount of air moved per breath during normal, resting breathing is tidal volume. It represents the air inhaled or exhaled in a quiet breath and in a healthy adult is about 500 mL on average. This distinguishes it from other lung volumes and capacities that describe larger or residual air in the lungs. Vital capacity refers to the total amount of air you can exhale after a maximum inhalation, which includes several parts (tidal, inspiratory reserve, and expiratory reserve) and is not about a single resting breath. Residual volume is the air left in the lungs after a maximal exhale, a baseline amount that stays in the lungs and cannot be measured by simple spirometry. Inspiratory capacity is the maximum amount you can inhale after a normal exhale, combining tidal volume with the inspiratory reserve, again not describing normal breath volume.

The amount of air moved per breath during normal, resting breathing is tidal volume. It represents the air inhaled or exhaled in a quiet breath and in a healthy adult is about 500 mL on average. This distinguishes it from other lung volumes and capacities that describe larger or residual air in the lungs.

Vital capacity refers to the total amount of air you can exhale after a maximum inhalation, which includes several parts (tidal, inspiratory reserve, and expiratory reserve) and is not about a single resting breath. Residual volume is the air left in the lungs after a maximal exhale, a baseline amount that stays in the lungs and cannot be measured by simple spirometry. Inspiratory capacity is the maximum amount you can inhale after a normal exhale, combining tidal volume with the inspiratory reserve, again not describing normal breath volume.