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. And those two electrons are then carried from complex one to complex three and two, complex four. And in the process, as the electrons move, we basically pump h plus ions into the intermembrane space from the mitochondrial matrix and this establishes an electrochemical gradient. And then the ATP synthase enzyme basically uses our H plus ions uses our electrochemical gradient to synthesize our ATP molecule.