Oxygen is critical for our survival and the proper functioning of aerobic respiration. What role does oxygen play during the respiration process? 1) The difference in oxygen concentration across the inner mitochondrial membrane is used as an energy source to pump hydrogen ions across the membrane. 2) Oxygen serves as the high energy electron donor for NADH dehydrogenase complex. 3) Oxygen serves as the electron acceptor at the end of the electron transport chain. 4) Oxygen shuttles an electron between the NADH dehydrogenase complex and the cytochrome C reductase complex.
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