Here is an How efficient is respiration in generating ATP?Complete oxidation of glucose releases 686 kcal/mol.Phosphorylation of ADP to form ATP requires at least 7.3 kcal/mol.Efficiency of respiration is 7.3 kcal/mol times 38 ATP/glucose divided by 686 kcal/mol glucose, which equals 0.4 or 40%.Approximately 60% of the energy from glucose is lost as heat.Some of that heat is used to maintain our high body temperature (37°C).Cellular respiration is remarkably efficient in energy conversion.Concept 9.5 Fermentation enables some cells to produce ATP without the use of oxygenWithout electronegative oxygen to pull electrons down the transport chain, oxidative phosphorylation ceases.However, fermentation provides a mechanism by which some cells can oxidize organic fuel and generate ATP without the use of oxygen.
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