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1?
sarcolemma
2?
synaptic gap
3?
motor nerve
4?
axon terminal
5?
vesicle; ACh
6?
motor end plate
7?
t-tubule
8?
sarcoplasmic reticulum
9?
z line
10?
myosin heads
11?
myosin
12?
actin
13?
calcium ions