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An internal secretion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the formation and discharge by the glands of internal secretion of their products, or hormones (incretions), directly into the blood or lymph. In contrast, glands of external secretion (digestive, sebaceous, sweat) discharge their secretions through an excretory duct to the surface of the body or into the cavities of internal organs.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.