Now, the entire point of the citric acid cycle is to actually further oxidize the glucose derivative molecules so that we can extract those high energy electrons and place those high energy electrons onto special calorie molecules we call NAD plus an fad. Now, what's the point of extracting these high energy electrons? Well, the point of extracting these high energy electrons is to use the high energy electrons to basically oxidatively phosphorylate ADP molecules into ATP molecules along the electron transport chain. So we ultimately use the NADH molecules and the fadh, two molecules produced in glycolysis and the citric acid cycle, to actually generate those high energy ATP molecules. And this takes place in the electron transport chain. So the culmination of aerobic cell respiration is oxidative aspiration along the proteins of the electron transport chain.