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A member asked:
Can any doc explain why can't we exhale residual volume?
A doctor has provided 1 answer
See below: By definition, residual volume is residual, or left behind in your lungs. This is needed to keep your lung tissue from closing shut due to the surface tension of the fluid (surfactant) in your lungs which allows gas exchange. It's similar to a wet, soapy glass or cup in the sink. It sometimes sticks to the sink and you need a little more force to break the surface tension of the water.
Answered 11/30/2014
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