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respiratory quotient  RQ; the ratio of the volume of carbon dioxide given off by the body tissues to the volume of oxygen absorbed by them; usually equal to the corresponding volumes given off and taken up by the lungs. It varies with the fuel source used: for carbohydrates it is 1.0; for lipids 0.7; for proteins 0.8; and with overfeeding (lipogenesis) 1.0–1.3.




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