Acetylcholine (ACh) is a type of neurotransmitter that can be released in the synapse. After it is released, What is one possible way to stop its effect on the postsynaptic cell?
1) An enzyme called acetylcholinesterase breaks ACh down so it no longer can bind to the receptor
2) Microglia move into the synapse to clear it
3) ACh is taken into the postsynaptic cell and therefore removed from the synapse
4) ACh will irreversibly bind to the receptors on the postsynaptic cell until all the ACh is used up