Answer :
Inspiratory reserve volume, or IRV, is the amount of air that can be forcibly inspired after a normal a) inhalation.
All human life depends on the process of breathing, which includes the inhalation of air. Although there are occasional exceptions in certain illness states, the process is autonomic and does not require cognitive control or effort. Breathing, however, can be actively altered or stopped (within limits).
In order to survive, humans and many other species must have access to oxygen, which can enter the lungs through breathing and then added into the blood. The air volume are used to study the disease pattern related to respiratory system. Spirometer is used for measuring the amount of air inhaled.
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