Now, as long as our acetylcholine molecule is found inside our synaptic cleft, it will continue to bind onto the binding side of these channels. And as long as our acetylcholine binds to these channels, that will continue to create or generate the action potential, which will continue to cause the muscle to contract. So how exactly do we stop the contraction of the muscle? Well, basically, a special type of enzyme known as acetylcholine esterase goes on and binds onto our acetylcholine that is bound onto our channel. So that is shown in this diagram. So we have the protein channel.