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7 steps action potential
The action potential arrives at the axon terminal
Calcium channels open allowing calcium ions to enter the axon terminal
Acetylcholine is released into the synaptic cleft and calcium ions are pumped out of the axon terminal
Acetylcholine binds to receptor sites on the motor end plate
An action potential is generated which propagates and travels down t-tubulues
The action potential causes the release of calcium ions
Calcium ions trigger a contraction of the muscle cell