O-Acetylcholine is a neurotransmitter that was discovered in 1920, making it
the first neurotransmitter ever discovered. This neurotransmitter is located
in the brain, neuromuscular junctions, spinal cord, and in both the
postganglionic terminal buttons of the parasympathetic division of the
autonomic nervous system and the ganglia of the autonomic nervous system. The
receptor sites can be ionotropic ( nicotinic receptor ) or metabotropic (
muscarinic receptor), which makes it possible for acetylcholine to produce
either an IPSP or an EPSP response. Some believe that O-Acetylcholine is
somehow linked to memory storage but this link is still unclear. However, the
pathways seem better suited as a modulator system than as an
information-containing, information-storing system.
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