|norepinephrine (ˌnɔːrɛpɪˈnɛfrɪn, -riːn)|
|the US name for noradrenaline|
|the ability of an organism or part of an organism to react to stimuli; degree of susceptibility to stimulation|
|a progressive wave of excitation over a nerve or muscle fiber that has a stimulating or inhibitory effect|
norepinephrine nor·ep·i·neph·rine (nôr'ěp-ə-něf'rĭn)
A substance, both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood. Also called levarterenol, noradrenalin.
|norepinephrine (nôr'ěp-ə-něf'rĭn) Pronunciation Key
A substance that acts both as a neurotransmitter and hormone, secreted in the central nervous system, at the nerve endings of the sympathetic nervous system, and by the adrenal gland. Norepinephrine is similar to epinephrine in its physiological effects but acts to regulate regular physiologic activity rather than being released in response to stress. Also called noradrenaline. Chemical formula: C8H11NO3.