The Krebs cycle, like glycolysis, contains many steps and produces many products before it produces its end products of NADH and FADH2. The Krebs cycle also produces the CO2 that animals exhale.
The last component of aerobic respiration is oxidative phosphorylation. This process yields the most usable energy for the cell. The electrons from NADH and FADH2 move down an electron transport chain and the energy lost by the electrons is used to phosphorylate ADP to ATP.
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