Now, once we form our NADH molecules, those NADH molecules then travel to the electron transport chain. Now, the electron transport chain is found in the inner phospholipid bilayer membrane of the mitochondria that is shown on the board. So we have the mitochondrial matrix, we have the inner membrane, the intermembrane space, and our outer mitochondrial membrane that is not shown, which is found somewhere here. Now, basically, the electron transport chain is a series of four protein complexes, protein complex one, two, three and four, as well as a protein complex known as ATP synthase. So when we synthesize NADH, it basically goes on to protein complex number one, also known as NADH dehydronates. And this complex basically accepts our electrons from the NADH and it oxidizes it back into the NAD plus.