+Acetylcholine (ACh) is a primary [Neurotransmitter](/wiki/neurotransmitter), a chemical messenger vital for communication within the [Nervous system](/wiki/nervous_system). It orchestrates muscle contraction and profoundly influences processes like learning, memory, and attention.
+## See also
+- [Synapse](/wiki/synapse)
+- [Dopamine](/wiki/dopamine)
+- [Memory](/wiki/memory)
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