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____ is both a hormone and a neurohormone that plays an important role in the fight-or-flight response

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Norepinephrine (noradrenaline) is both a hormone and a neurohormone that plays an important role in the fight or flight response. Norepinephrine is released from the neuronal endings of the sympathetic nervous system, which is set-off by the amygdala, and mediates the fight or flight response. So in this case, norepinephrine is used as a neurotransmitter (neurohormone).

Norepinephrine is also released from the adrenal medulla when activated by the sympathetic nervous system, and the norepinephrine is subsequently released into the bloodstream, now acting as a hormone.

answered Dec 10, 2015 by drcarlo (294,080 points)
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