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The Epic Interactive Encyclopedia 1997
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1992-09-02
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Gland that discharges secretions, usually
through a tube or a duct, onto a surface.
Examples include sweat glands which release
sweat onto the skin, and digestive glands
which release digestive juices onto the walls
of the intestine. Some animals also have
endocrine glands (ductless glands) that
release hormones directly into the
bloodstream.