Gland

Gland, an organ in an animal's body that synthesises a substance for release, often into the bloodstream (endocrine gland) or into cavity inside the body or outer surface (exocrine gland[?]).

Humans have a large variety of glands, from the pituitary gland in the brain, to sweat glands[?] over the body's skin that release perspiration to regulate the body's temperature.

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