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. Now, all types of pumps are energy transducers and what that basically means is they transform energy from one form to another. So in the case of ATP Aces, they transform the energy stored in the chemical bonds of ATP into the energy stored in establishing that electrochemical gradient. So we see that membrane pumps are responsible for actually using ATP or energy to create establish these electrochemical gradients.