Acetylcholine is neuromuscutar transmitter which involved with neuromuscular junction. Neuromuscular junction is a specialized form of synapse found between a motor neuron and skeletal muscle fibre. When depoarisation of the motor end plate reaches a certain level it creates an action potential. After this an enzyme cholinesterase present along with receptor sites for acetylcholine breaks down acetylcholine into acetate and choline. Acetylcholine, norepinephrine and dopamine are neurotransmitters. Neurotransmitters are chemicals released from a presynaptic neuron that interact with specific receptor sites of a post synaptic neuron.