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  • Created by: LissT
  • Created on: 11-04-10 19:01
  • Hormones are chemical messengers that travel in the blood to activate target cells
  • They are carried in the blood plasma to other parts of the body, but they only affect target cells
  • They are released directly into the blood
  • Hormones are secreted by various glands
  • Hormones tend to have long-lasting effects
  • They travel at the "speed of blood"


The Pituitary Gland

  • secretes many important hormones


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