And once at the axon terminal, it basically stimulates the release of hundreds of these vesicles that carry acetylcholine molecules. So these vesicles containing acetylcholine are released into this area known as the synaptic cleft, and it travels along that synaptic cleft, and these acetylcholine ultimately end up binding onto special ligand gated I channels we call acetylcholine receptors, which are these protein membranes shown here. Now, when they bind, they cause the opening of these ligand gated ion channels. And the thing about these ligangated ion channels is they're nonspecific. And what that means is they will allow the movement of not only the sodium ions down their electrochemical gradient, but also allow the movement of these potassium down their electrochemical gradient. And so we know that we have many more potassium molecules on the inside than on the outside.