Now, once these high energy electrons are extracted, they begin to move along the proteins of the inner membrane of the mitochondria. And from basic physics, we know that whenever electrons flow from .1 to .2, the flow of that electron or the flow of the electrons creates an electrical current. And that electrical current can be used to carry out some process. So what process are we ultimately carrying out? Well, as these high energy electrons are moving along the proteins of the electron transport chain, that allows some of these proteins to actually act as proton pumps and pump H plus ions from the matrix of the mitochondria to the intermembrane space. So protein complex one, three, and four actually allow the movement of these H plus ions.