Question

Volume of air inspired and expired with each normal breath is called as

• A. Tidal volume
• B. Inspiratory capacity
• C. Total lung capacity
• D. Residual volume

Answer 1

The correct option is A Tidal volume

Tidal volume is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied. In a healthy, young human adult, tidal volume is approximately 500 mL per inspiration or 7 mL/kg of body mass. Inspiratory capacity is the volume of air that can be inspired after a normal expiration or it is the sum of the tidal volume and the inspiratory reserve volume. Total lung capacity (TLC) is the inspiratory capacity plus the functional residual capacity or the volume of air contained in the lungs at the end of a maximal inspiration or also equals vital capacity plus residual volume. Residual volume is the amount of air that remains in a person's lungs after fully exhaling. Doctors use tests to measure a person's residual air volume to help check how well the lungs are functioning. Thus, option A is correct.