So we have the glycolysis process that breaks down glucose into two pyruvate molecules. Those eventually go into the mitochondrial matrix where they undergo a decarboxylation reaction to form a Ctilt coenzyme a, which is fed into the citric acid cycle. And the citric acid cycle ultimately produces NADH molecules and fadh two molecules. And then all the NADH and fadh two molecules produced in aerobic cellular respiration go onto the electron transport chain to basically form ATP molecules. Now, we know in aerobic cellular respiration one glucose molecule produces a net of 36 ATP molecules. Now, the problem is, glucose is not the only type of molecule from which we can actually obtain our energy.