Submitted by 23Silicon t3_yq9ctu in askscience
CrateDane t1_ivu1ois wrote
Reply to comment by uh-okay-I-guess in Why do people say that we “turn oxygen into carbon dioxide?” by 23Silicon
There's also eg. beta oxidation of fatty acids. That cyclically generates a double bond, hydrates it, and cleaves off, until the end of the carbon chain. The hydration can use water that came from the electron transport chain, so oxygen that was initially reduced to water can still end up in CO2.
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