Hormone Facts



  • Hormones are the body’s chemical messengers, released from stores at times to trigger certain reactions in different parts of the body.
  • Most hormones are endocrine hormones which are spread around your body in your bloodstream.
  • Each hormone is a molecule with a certain shape that creates a certain effect on target cells.
  • Hormones are controlled by feedback systems. This means they are only released when their store gets the right trigger — which may be a chemical in the blood or another hormone.
  • Major hormone sources include: the pituitary gland just below the brain; the thyroid gland; the adrenal glands; the pancreas; a woman’s ovaries; a man’s testes.
  • The pituitary is the source of many important hormones, including growth hormones which spur growing.
  • Adrenaline is released by the adrenals to ready your body for action.
  • Endorphins and enkephalins block or relieve pain.
  • Estrogen and progesterone are female sex hormones that control a woman’s monthly cycle.
  • Testosterone is a male sex hormone which controls the workings of a man’s sex organs.