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boyakko [2]
4 years ago
9

A muscle contraction begins when

Biology
2 answers:
kupik [55]4 years ago
5 0
When acetylcholine is released and binds to receptors on the muscle membrane. Hope this helps! ❤
Dmitry [639]4 years ago
4 0

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

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