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The ion that triggers the release of acetylcholine into the synaptic cleft is.

User Thesowismine
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Answer:

calcium influx

Explanation:The calcium influx triggers synaptic vesicles, which package neurotransmitters, to bind to the presynaptic membrane and to release acetylcholine into the synaptic cleft by exocytosis.

User Jjoelson
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