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Sympathin |
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Sympathin
an obsolete general name for a biologically active substance similar in structure to adrenaline. In vertebrates (including man), sympathins are secreted when impulses are transmitted from sympathetic nerves (hence the name) to the organ that performs a particular function. In early research on humoral regulation the sympathetic mediators of nervous excitation were called sympathins. Later it was established that the properties of a mediator are exhibited in the peripheral sections of the sympathetic nervous system by norepinephrine and in the central sections of dopamine. In amphibians sympathins have been identified as adrenaline. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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