nor·ep·i·neph·rine (nôr  p- -nf r n)n. A substance, C8H11NO3, 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 noradrenaline. |
norepinephrine [ˌnɔːrɛpɪˈnɛfrɪn -riːn]
n
(Life Sciences & Allied Applications / Biochemistry) the US name for noradrenaline
| norepinephrine (nôrp--nfrn) 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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | norepinephrine - a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses pressor, vasoconstrictive, vasoconstrictor - any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure monoamine neurotransmitter - a monoamine that is functionally important in neural transmission catecholamine - any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland |
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