Clark, Nancy Barnes Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut.
Last reviewed:February 2021
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The study of the glands of internal secretion—the endocrine glands—and the hormones that they synthesize and secrete. Endocrinology is the field of medicine and physiology concerned with the endocrine system, which regulates hormones (chemical messengers). Endocrine glands (see illustration) are ductless. Therefore, hormones are secreted directly into the blood to be carried to the target tissue or organ. Hormones are highly specific, and their action may be selective or generalized. See also: Endocrine system (invertebrate); Endocrine system (vertebrate); Hormone
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