The amount of air inspired and expired during normal respiration is known as-

Correct option is D

The correct answer is (d) Tidal volume.
· Tidal volume is the amount of air that is inhaled or exhaled during a normal, relaxed breath. It represents the volume of air exchanged in and out of the lungs during each respiratory cycle when a person is at rest. For a healthy adult, the tidal volume is typically about 500 milliliters per breath.
Information Booster:
· Minute volume:
· Definition: The total volume of air breathed in or out in one minute.
· Calculation: It is the product of the tidal volume and the respiratory rate (number of breaths per minute).
· Residual volume:
· Definition: The volume of air remaining in the lungs after a maximum exhalation.
· Importance: It prevents lung collapse and ensures continuous gas exchange even between breaths.
· Vital capacity:
· Definition: The maximum amount of air that can be exhaled after a maximum inhalation.
· Components: It includes tidal volume, inspiratory reserve volume (the additional air that can be inhaled after a normal inhalation), and expiratory reserve volume (the additional air that can be exhaled after a normal exhalation).