The amount of air breathed in and out during a normal respiration by human lungs is referred to as

  1. A. Vital capacity
  2. B. Tidal volume
  3. C. Inspiratory volume
  4. D. Total lung capacity

Correct Answer: B. Tidal volume

Explanation

Tidal volume is the volume of air displaced between normal inhalation and exhalation when extra effort is not applied.

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