And so what that means is this type of movement is known as facilitated diffusion. Now, since channels move ions and molecules down their electrochemical gradient, no energy is actually used. And so what that means is this mode of transport is known as passive transport. Now, we have many different types of examples of channels that exist inside our body. And two examples that we're going to focus on in future lectures will be voltage gated channels and gap junctions. So voltage gated channels are used by our neurons to basically create that action potential, while gap junctions are used by, for instance, our cardiac muscle cells to create this forceful contraction of the heart.