Now, the electron transport chain is basically a series of protein complexes that are found on the inner membrane of the mitochondria. And what happens is the NADH molecules and the Fad H two molecules basically transport or transfer the electrons onto our electron transport chain. And these electrons basically eventually end up reducing oxygen and forming water. And in the process, our electron transport chain establishes an electrochemical gradient between the intermembrane space of the mitochondria and the mitochondrial matrix. And one of the proteins of the electron transport chain known as ATP synthase utilizes the electrochemical gradient to synthesize our ATP molecules. Now we see that a single NADH molecule produced in the mitochondrial nature creates three ATP molecules.