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Definition: 'Norepinephrine'

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norepinephrine (NE)

Type: Term

Pronunciation: nōr′ep-i-nef′rin

Definitions:
1. A catecholamine hormone the natural form of which is d, although the l form has some activity; the base is considered to be the postganglionic adrenergic mediator, acting on α and β receptors; it is stored in chromaffin granules in the adrenal medulla in much smaller amounts than epinephrine and secreted in response to hypotension and physical stress; in contrast to epinephrine it has little effect on bronchial smooth muscle, metabolic processes, and cardiac output, but has strong vasoconstrictive effects and is used pharmacologically as a vasopressor, primarily as the bitartrate salt.

Synonyms: levarterenol, noradrenaline

The definition information for norepinephrine is provided by Stedman's. You can search our medical dictionary here.

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Medical Dictionary Copyright © 2006 Lippincott Williams & Wilkins. All rights reserved.







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