So we basically transform the energy that is stored in the movement of electrons into the energy that is stored in the gradient that exists between the two sides as a result of the unequal distribution of H plus ions. And then we ultimately transform that energy into the energy that is stored in the chemical bonds of the ATP molecules because it's the ATP molecules which can be used by ourselves to carry out a variety of different types of processes. So the final thing that I'd like to focus on in this lecture is some facts that you should know about the mitochondrion found inside our cells. So, as I mentioned in the beginning, the mitochondrion actually consists of two different types of membranes. We have the outer membrane and the inner membrane. So the innermost compartment of the mitochondrion is known as the mitochondrial matrix.