Q:

Finish the sentence so that it is correct: A hormone may be defi ned as a chemical messenger that:

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 Finish the sentence so that it is correct: A hormone may be defi ned as a chemical messenger that:


  1. is released into circulation in small quantities
  2. facilitates communication between adjacent cells.
  3. moves through extracellular fl uid between cells of a single tissue
  4. crosses the synaptic cleft and binds to a receptor

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A: Hormones travel through the blood to all parts of the body and only small quantities are required. 

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