Events at the neuromuscular Junction: 1) AP arrives at axon terminal, 2) Voltage-gated calcium channels open, calcium goes in motor neuron, 3) Calcium causes a release of ACh neurotransmitter into synpatic cleft, 4) ACh diffuses across to ACh receptors on sarcolemma, 5) ACh binding to receptors, opens gates, allowing NA+ to enter causin in end plate potential, 6) Acetylcholinesterase degrades ACh