Terminal of neuromuscular junction

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Discuss how nerve impulse (action potential) at axon terminal of neuromuscular junction causes skeletal muscle contraction..The neuromuscular junction (NMJ) is a synaptic connection between the terminal end of a motor nerve and a muscle (skeletal/ smooth/ cardiac). It is the site for the transmission of action potential from nerve to the muscle. It is also a site for many diseases and a site of action for many pharmacological drugs

List the steps and describe them shortly