A muscle contraction begins when

asked Dec 16, 2020 164k views

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When acetylcholine is released and binds to receptors on the muscle membrane. Hope this helps! ❤

Spas answered Dec 17, 2020

by Spas

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4 votes

ACh released into the neuromuscular junction and binds to receptors on the sarcolemma

Jared Loomis answered Dec 22, 2020

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