Tidal volume is defined as which of the following?

Tidal volume is defined as which of the following?

• A. The total air that can be moved in and out of the lungs during a deep breathing exercise
• B. The maximum amount of air that can be exhaled after a maximal inhalation
• C. The air remaining in the lungs after a forced exhalation
• D. Amount of air that moves in and out of the lungs during a normal breath

Answer: (D)

Tidal volume is the amount of air moved in and out of the lungs during a normal breath. It’s about 500 mL in a healthy adult and varies with size, fitness, and breathing conditions. This distinguishes it from volumes measured during deep or maximal breathing (which involve inspiratory reserve or vital capacity) and from the air left in the lungs after a forceful exhalation (residual volume).

Tidal volume is the amount of air moved in and out of the lungs during a normal breath. It’s about 500 mL in a healthy adult and varies with size, fitness, and breathing conditions. This distinguishes it from volumes measured during deep or maximal breathing (which involve inspiratory reserve or vital capacity) and from the air left in the lungs after a forceful exhalation (residual volume).