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. And so that's exactly what a pump is, an Atpas. And we're going to look at many different types of examples of Atpas. So two types of examples that we're going to look at are the ptype, Atpas and the ABC transporter, which is also an ATP ace.