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State whether the following is true or false.
A hormone circulating in the blood affects every cell it reaches.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: A

Only cells bearing the appropriate receptor can respond, so the same molecule passes most tissues without effect. Specificity resides in the receptor rather than in the distribution of the signal. A cell without the receptor is simply blind to the message.

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