in Chemical Coordination and Regulation (Endocrine System) by

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  1. Hormones are defined as ‘a chemical substance that is secreted into the body fluids by one cell or a group of cells and that exerts a physiological control/effect on other cells of the body’.
  2. They are chemical messengers which carry specific information.
  3. The organ on which a hormone acts is called as a target organ.
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