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Consumption of molecular oxygen

Why the consumption of molecular oxygen point out the metabolic rate of aerobic organisms?

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Molecular oxygen (O2) consumption consists of direct relation to the cell metabolic rate in an aerobic cell and therefore to the metabolic rate of the organisms. Cells containing higher metabolic activity demand more energy and this energy comes from ATP molecules. As there is requirement for ATP production, the intensity of aerobic cell respiration is too higher and then much oxygen is consumed.

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