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Cellular Respiration
Electron Transport Chain

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Home | Glycolysis | Krebs Cycle | Electron Transport Chain | Transition Reaction

The final energy transformation stage in aerobic respiration is oxidative phosphorylation vy the chimiosmosis of ADP.  The coenzymes educed to NADH and Fadh2 transport their electrons and H+ ions to the cristae of the mitochondrion. The electron transport chain (respiratory chain) is a series of electron transporters and multi enzyme complexes. These proteins and enzymes oxidize NADH+ and FADH2. As soon as the remainder of the electrons have been removed, the H+ ions are as well. This allows NAD and FAD to return to the reactions in the matrix.
The oxidation and reduction of the electron transport chain liberate small amounts of energy. This energy is used to energize the proton pumps which pump the H+ ions across the internal membrane into the intermediate space. Since these ions are between the 2 membranes, a concentration gradient is created.  The movement of H+ through ATP synthase helps the synthesis of ATP. (32/34 are created in ETC)
Most of the ATP is created in the ETC then anywhere else in the cellular respiration. The chimiosmosis and oxidative phosphorylation of the electron transport chain give enough energy (ATP) for warm blooded organisms to keep body temperature and the other enormous demands of energy.