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'''Norepinephrine''' (chemical name C₈H₁₁NO₃)is a catecholamine present in the human brain, sometimes referred to as noradrenaline.  Norepinephrine acts as a [[hormone]] when it is released from the [[adrenal gland]]s into the bloodstream.  In concert with [[epinephrine]], norepinephrine influences the [[fight or flight]] response by increasing heart rate and muscle readiness, and increasing energy by causing [[glucose]] release, thereby heightening readiness to respond (e.g., to fight or flee) to a stressful event.

'''Norepinephrine''' (chemical name C₈H₁₁NO₃) is a catecholamine present in the human brain, sometimes referred to as noradrenaline.  Norepinephrine acts as a [[hormone]] when it is released from the [[adrenal gland]]s into the bloodstream.  In concert with [[epinephrine]], norepinephrine influences the [[fight or flight]] response by increasing heart rate and muscle readiness, and increasing energy by causing [[glucose]] release. Thus, it heightens readiness to respond to a stressful event.

Norepinephrine also acts as a [[neurotransmitter]] in the [[central nervous system]] and [[sympathetic nervous system]].  It influences alertness and arousal, and lower levels are associated with [[depression|depressed mood]].  Many [[antidepressant]] medications cause increased norepinephrine levels in the brain.  Drugs that increase norepinephrine are also used in the treatment of [[Attention Deficit Hyperactivity Disorder]] and [[hypotension]] (low blood pressure).

Norepinephrine also acts as a [[neurotransmitter]] in the [[central nervous system]] and [[sympathetic nervous system]].  It influences alertness and arousal, and lower levels are associated with [[depression|depressed mood]].  Many [[antidepressant]] medications cause increased norepinephrine levels in the brain.  Drugs that increase norepinephrine are also used in the treatment of [[Attention Deficit Hyperactivity Disorder]] and [[hypotension]] (low blood pressure).

[[category:neuroscience]]

[[category:neuroscience]]