Definition: Norepinephrine is a neurotransmitter or chemical messenger that helps to relay messages from one area of the brain to another. It is involved with arousal, attention and mood. In the body, it is involved with the "fight or flight response."
Norepinephrine - What is Norepinephrine
By Keath Low, About.com
Updated: August 14, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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