norepinephrine
Also known as: arterenol, noradrenaline

What is it?

A CATECHOLAMINE that is the chemical means of transmission across SYNAPSES of the SYMPATHETIC NERVOUS SYSTEM and in some parts of the CENTRAL NERVOUS SYSTEM, and is a precursor (a preliminary form) of EPINEPHRINE in its major chemical pathway — called also arterenol, noradrenaline;

Merriam-Webster's Medical Dictionary, 1995 Edition.
 
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