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sympathin

Pronunciation: sim'pa-thin

Definition: The substance diffusing into circulation from sympathetic nerve terminals when they are active. The term was introduced by WB Cannon, who thought that this substance differed from the mediator produced by the nerve ending (now known to be incorrect); the mediator itself (norepinephrine) diffuses into circulation.

Synonym(s): sympathetic hormone

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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