So the movement of this electric current allows us to actually pump these H plus ions to the intermembrane space of the mitochondria. And once these electrons end up on protein complex four, this is where we actually use those electrons to actually reduce the diatomic oxygen, the same oxygen that we breathe in from the environment to form the water molecules in the process. Once we generate this proton gradient across the two sides of the membrane, we use another protein complex known as ATP synthase to actually generate those ATP molecules. So ultimately, we establish a proton gradient in which we have a high proton concentration here and a low proton concentration here. And this ATP synthase basically uses that established electrochemical gradient of H plus ions, moves these H plus ions down that established electrochemical gradient from a high to a low electrochemical potential. And that allows the ATP synthase to actually phosphorylate ADP to ATP.