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السؤال 97

Complete the endocrine-system statement: hormones are___

  1. chemical messengers carried to target cellsالإجابة الصحيحة
  2. electrical impulses inside axons
  3. organs that digest food
  4. signals that act only where released

الشرح

Hormones carry chemical information from releasing cells to receptive target cells, often at other locations in the body. They are not electrical impulses traveling along axons, even though nervous and endocrine communication can interact.

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