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finally, the muscle fiber returns to its resting ___
length
relaxation begins when nerve signals quit stimulating the synaptic knob from releasing ___
acetylcholine
active trnaport pumps in the SR move ___ back into the cisternae
calcium
acetylcholine dissociates from its ___ and no new moleciles of acetylcholine are released
receptor
___ moves back into position blocking active sites and no more contractions can occur
tropomyosin
