Final answer:
The Inspiratory Reserve Volume (IRV) is the amount of additional air that can be inhaled above the resting tidal volume during a deep breath.
Step-by-step explanation:
The amount of air that you can inhale above the resting tidal volume is known as the Inspiratory Reserve Volume (IRV). During normal breathing, without extra effort, the tidal volume (TV) represents the amount of air that is inspired and expired, which is approximately 500 milliliters. However, when a deep inhalation occurs beyond this tidal inspiration, the extra volume that can be inhaled is referred to as the Inspiratory Reserve Volume. This volume demonstrates the additional air your lungs can accommodate beyond their normal intake with a forced inhalation.