What order do these go in?

1. Cholinesterase attaches to acetylcholine
2. Acetylcholine is released from the vesicles in the presynaptic neuron.
3. The electrochemical impulse reaches the end plate of the presynaptic neuron.
4. Sodium channels are opened along the postsynaptic neuron.

3. The electrochemical impulse reaches the end plate of the presynaptic neuron.

2. Acetylcholine is released from the vesicles in the presynaptic neuron.
1. Cholinesterase attaches to acetylcholine.
4. Sodium channels are opened along the postsynaptic neuron.