SYN: norepinephrine.
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n.
a hormone, closely related to adrenaline and with similar actions, secreted by the medulla of the adrenal glands and also released as a neurotransmitter by sympathetic nerve endings. Among its many actions are constriction of small blood vessels leading to an increase in blood pressure, increased blood flow through the coronary arteries and a slowing of the heart rate, increase in the rate and depth of breathing, and relaxation of the smooth muscle in intestinal walls.
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nor·adren·a·line (nor″ə-drenґə-lin) norepinephrine.Medical dictionary. 2011.