Li, Choh Hao Formerly, Laboratory of Molecular Endocrinology, University of California, San Francisco, California.
Mazzone, Theodore Section of Diabetes and Metabolism, University of Illinois, Chicago, Illinois.
- Production and circulation
- Molecular mechanisms of action
- Links to Primary Literature
- Additional Readings
One of the chemical messengers produced by endocrine glands, whose secretions are liberated directly into the bloodstream and transported to a distant part or parts of the body, where they exert a specific effect for the benefit of the body as a whole. The endocrine glands involved in the maintenance of normal body conditions are pituitary, thyroid, parathyroid, adrenal, pancreas, ovary, and testis (see illustration). However, these organs are not the only tissues that are involved with the hormonal regulation of body processes. For example, the duodenal mucosa, which is not organized as an endocrine gland, elaborates a substance called secretin, which stimulates the pancreas to produce its digestive juices. The placenta is also a very important hormone-producing tissue. See also: Endocrine mechanisms; Endocrine system (invertebrate); Endocrine system (vertebrate); Gland; Signal transduction
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