But what happens is when an action potential basically reaches this section of the neuron, it stimulates these vesicles to be released to this environment. And once these vesicles are released via exocytosis, they release these neurotransmitters we call Acetylcholine. And acetylcholine is the ligand that binds onto these ligand gated ion channels, which open up and then allow the spontaneous movement of these sodium ions from the outside into the inside of that cell. And that can create another action potential. Or it can make a muscle contract or do many other things, as we'll discuss in a future lecture. Now let's move on to voltage gated ion channels.