noun, Physiology.
the ratio of the amount of carbon dioxide released by the lungs to the amount of oxygen taken in during a given period.
respiratory quotient
(biology) the ratio of the volume of carbon dioxide expired to the volume of oxygen consumed by an organism, tissue, or cell in a given time

respiratory quotient n.
Abbr. R.Q.
The ratio of carbon dioxide produced by tissue metabolism to oxygen consumed in the same metabolism.


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