definition of complete or incomplete ventilation
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The word "complete" in "complete ventilation" is misleading in that all of the air is never pushed out of the lungs even when you try hard to do so -- far from it. The relevant comparison here isn't even to the forced breathing figures one could produce on a pulmonary function test; it's just compared to normal breathing. If something is keeping the animal from breathing normally, but doesn't stop its breathing entirely, incomplete ventilation may be seen. So for instance, if normal breathing hurts, one might reduce one's tidal volume.
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Complete ventilation is a condition in which the quality of return air of a given space remains constantly maintained and desired level with a given constant supply of air.
The decrease in the quality or the quantity of air supplied that causes a decrease in space’s air quality is incomplete ventilation.
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