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1
Motor neuron depolarization
2
Action potential travels down axon to NMJ
3
AP cause Ca2+ ions to influx into synaptic bulb
4
ACh is released into synaptic cleft
5
ACh binds to receptors on muscle cells sarcolemma
6
Na+ ion channels in sarcolemma open
7
Depolarization of sarcolemma occurs
8
AP travels down T-tubules
9
Ca2+ is released from terminal cisternae
10
Ca2+ ions influx into sarcoplasm
11
Ca2+ binds to troponin
12
Tropomyosin is moved on the actin fibers
13
Myosin binding sites on actin are exposed