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
Explore ADD / ADHD
Must Reads
About.com Special Features
Learn how you can reduce your your numbers with these nutrition and exercise tips. More >
Keep yourself, and your family, happy and healthy this fall with these tips. More >
Also from About.com:
©2009 About.com, a part of The New York Times Company.
All rights reserved.