But now we're looking not at a channel, but at an ATPase, a pump that uses ATP. And so what this does is it uptakes an ATP molecule from the inside, it hydrolyzes that ATP molecule. And that creates a conformational change in the structure of that pump. And once that conformational change takes place, it basically forces a sodium ion to move against its electrochemical gradient. From the inside a low potential, to the outside a high potential. So the pump actually uses energy stored in the chemical bonds of ATP and moves the sodium against the electric field lines against this electrochemical gradient.