Question

what is inspiratory reserve volume
volume of air still contained in the lungs after a maximal exhalation
volume of air in the lungs after the maximum inhalation
volume of air breathed in and out in a normal breath
additional inspired air over and above the tidal volume
maximum volume of air that can be exhaled after a maximum inhalation

Explanation:

Inspiratory reserve volume is the additional air that can be inhaled beyond the tidal volume during a deep breath.

Answer:

additional inspired air over and above the tidal volume