Norepinephrine/Definition

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Norepinephrine [r]: Precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. Norepinephrine is the principal transmitter of most postganglionic sympathetic fibers and of the diffuse projection system in the brain arising from the locus ceruleus. It is also found in plants and is used pharmacologically as a sympathomimetic.

This definition is at least in part based on: Anonymous (2015), Norepinephrine (English). Medical Subject Headings. U.S. National Library of Medicine.