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The calcium that triggers muscle contraction is stored in synaptic vesicles. the motor neuron. the mitochondria. the endoplasmic reticulum.

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the calcium that triggers muscle contraction is stored in synaptic vesicles called endoplastic reticulum. that is not the only function of  the endoplastic reticulum it is also a network of a membranous tubules within the cytoplasm of a eucryotic cell continuous with the nuclear membrane.
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