To reduce one molecule of O2 it takes 4 electrons.
Electron transfer is the last process of aerobic respiration that occurs in the inner membrane of mitochondria. In electron transport, the process of making ATP occurs which will later be used by cells to carry out activities in the body. The material for making ATP comes from NADH and FADH2 which are produced in glycolysis, oxidative decarboxylation, and the Krebs cycle. O2 acts as the final electron acceptor which will later form H2O which will be removed from the cell.
In electron transport, NADH and FADH are utilized in a series of oxidation-reduction reactions until finally used to reduce O2 to H2O. This redox reaction involving various protein complexes in the mitochondrial inner membrane is referred to as oxidative phosphorylation. The energy released in this redox process is converted into a high-energy molecule, namely ATP. To reduce one molecule of O2 it takes 4 electrons.
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