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A gland is a group of cells that prepare and release a chemical for use by the body.[1] There are two broad classifications of glands:

  • Endocrine glands secrete their chemicals directly into the blood stream.
  • Exocrine glands secrete through a duct.


  1. Wile, Dr. Jay L. Exploring Creation With General Science. Anderson: Apologia Educational Ministries, Inc. 2000