IRV = Inspiratory Reserve Volume
IRV stands for Inspiratory Reserve Volume
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Let's say you've just inhaled a normal breath (you've inhaled your normal
Tidal Volume). Now, your IRV is the amount of air you can still inhale
until you can't inhale no more.
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As illustrated in the figure below, it represents the amount of air
you are still able to inhale after you have already taken a normal breath.
Refer to this cool picture:
