Hormone: A hormone is a biologically active chemical substance, synthesized by a glandular cell and secreted into the internal environment where it circulates, acting remotely and through the bloodstream on specific receptors of a target cell. It transmits a message in chemical form and therefore plays a messenger role in the body. The term "hormone" (from the Greek ὁρμάω, to set in motion) was adopted by Starling in 1905 to designate the substances which bind ...
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