Norepinephrine (INN) or noradrenaline (BAN) is a catecholamine and a phenethylamine with chemical formula C₈H₁₁NO₃. The natural stereoisomer is L-(−)-(R)-norepinephrine. It is released from the medulla of the adrenal glands as a hormone into the blood, but it is also a neurotransmitter in the nervous system where it is released from noradrenergic neurons during synaptic transmission. As a stress hormone, it affects parts of the human brain where attention and impulsivity are controlled. Along with epinephrine, this compound affects the fight-or-flight response, activating the sympathetic nervous system to directly increase heart rate, release energy from fat, and increase muscle readiness.

The host of physiological changes activated by a stressful event are unleashed in part by activation of a nucleus in the brain stem called the locus ceruleus. This nucleus is the origin of most norepinephrine pathways in the brain. Neurons using norepinephrine as their neurotransmitter project bilaterally from the locus ceruleus along distinct pathways to the cerebral cortex, limbic system, and the spinal cord, among other projections.

At synapses it acts on both alpha and beta adrenoreceptors.

More on [ Norepinephrine ]

Norepinephrine - Twitter Search

Difference between norepinephrine and epinephrine - Helium http://t.co/1uT296Ga
LalithaWickrama (Lalitha Wickrama) Sat, 04 Feb 2012 07:11:26 -0000
Difference between norepinephrine and epinephrine - Helium http://t.co/1uT296Ga
Direct sympathomimetic catecholamines DINED: Dopamine Isoproterenol Norepinephrine Epinephrine Dobutamine
master_usmle (USMLE) Sat, 04 Feb 2012 06:55:27 -0000
Direct sympathomimetic catecholamines DINED: Dopamine Isoproterenol Norepinephrine Epinephrine Dobutamine
Difference between norepinephrine and epinephrine - http://t.co/UM0LGnQC
freelancehealth (freelance health) Sat, 04 Feb 2012 00:21:27 -0000
Difference between norepinephrine and epinephrine - http://t.co/UM0LGnQC
Difference between norepinephrine and epinephrine - http://t.co/ubcx3BNR
kumararatna (kumara ratna) Fri, 03 Feb 2012 23:52:52 -0000
Difference between norepinephrine and epinephrine - http://t.co/ubcx3BNR
Oxytocin, norepinephrine, testosterone, estrogen, vasopressin, seratonin, adrenaline,umm....
DerekAdams4 (Derek Adams) Fri, 03 Feb 2012 22:36:19 -0000
Oxytocin, norepinephrine, testosterone, estrogen, vasopressin, seratonin, adrenaline,umm....
@Hi_ViRuS yeah, elevated cortisol, GH and norepinephrine in my system. :D guess its time to sleep. :D gn!
mammothbrain (Mammoth Brain) Fri, 03 Feb 2012 18:18:37 -0000
@Hi_ViRuS yeah, elevated cortisol, GH and norepinephrine in my system. :D guess its time to sleep. :D gn!

Subscribe to Norepinephrine RSS feed