Exhalation: blows out a volume of air. The lung tissue will become more compressed but does not collapse at all. When you do a chest xray, you're asked to inhale deeply. The reason being there is more capacity for the xray machine to image more of your lung tissue. One exhalation can be from 2 to 3 Liters, depending on your body habitus.
Answered 3/27/2015
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