Q:

Which of the following could be a defi nition of a hormone

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Which of the following could be a defi nition of a hormone?


  1. chemicals released to communicate between adjacent cells in contact.
  2. a chemical messenger released into blood to coordinate activities in distant tissues.
  3. a chemical messenger released by a neurone at a synapse
  4. a chemical messenger in the extracellular fl uid between cells of a single tissue.

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B: Hormones are also known as circulating hormones, meaning they are transported in the blood

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