What is the endocrine system?


 
      The endocrine system is a set of body organs that secrete
 hormones into the bloodstream.  Carried to every part of the body,
 these hormones control many body functions.  Organs included in the
 endocrine system include the testes and ovaries, the pituitary, the
 thyroid, and the pancreas and adrenal glands.

      Hormones secreted by some endocrine glands control other
 endocrine glands.  For example, the pituitary gland in the brain
 secretes the hormones FSH and LH.(1)  In the male, they cause the
 testes to make the hormone testosterone.  The pituitary gland
 monitors the amount of testosterone produced by the testes.(1)  If
 the level of testosterone is high, the pituitary gland secretes
 less FSH and LH.  This signals the testes to stop producing
 testosterone.  If the testosterone level is low, the pituitary
 secretes more FSH and LH.  This causes the testes to produce more
 testosterone.  This is one example of how a feedback mechanism is
 used by the body to control many body functions.

 REFERENCES
 
 1.   Kuret JA, Murad F.  Adenohypophyseal hormones and related
      substances. In:  Gilman AG, Rall TW, Nies AS, Taylor P.  The
      pharmacological basis of therapeutics, 8th ed.  New York:
      Pergamon Press, 1990:1334-60.
 
 
 by Trent Tschirgi, R. Ph.
 (c) 1992 University of Maryland Office of Substance Abuse Studies.
 All Rights Reserved.


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