Acetylcholine - Definition

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Acetylcholine is a neurotransmitter, meaning that the substance transmits information from one neuron to another. It is stored in the vesicles at the end of a first neuron, and is secreted during an electrical impulse in the synapse (space between two neurons). Then, it will bind to the receptor end of a second neuron to propagate this influx before being recaptured by the vesicle it came from. This enables the propagation of a potential action (electrical impulses) in the nervous system. The main effects of acetylcholine include dilation of the arteries, a contraction of the bronchial tubes and gastrointestinal tract, and mucus secretion in the bronchial tubes.