1. Health
Send to a Friend via Email
You can opt-out at any time. Please refer to our privacy policy for contact information.



Updated September 26, 2011


Adrenaline can provide you with the motivation you need to fight or run, but a chronically-triggered stress response can cause wear and tear on your body.

Photo from iStockPhoto.com
Definition: Also known as epinephrine or adrenaline, adrenalin is a naturally occurring hormone. During the fight-or-flight response, the adrenal gland releases adrenalin into the blood stream, along with other hormones like cortisol, signaling the heart to pump harder, increasing blood pressure, opening airways in the lungs, narrowing blood vessels in the skin and intestine to increase blood flow to major muscle groups, and performing other functions to enable the body to fight or run when encountering a perceived threat.
Also Known As: epinephrine
Alternate Spellings: adrenaline

©2014 About.com. All rights reserved.

We comply with the HONcode standard
for trustworthy health
information: verify here.