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Signalling in which a cell releases a molecule that acts on nearby cells is described as

  • A.paracrine
  • B.endocrine
  • C.autocrine
  • D.synaptic

Answer: A

The signal diffuses only a short distance and is usually degraded or taken up quickly, which keeps its effect local. Endocrine signals travel in the bloodstream to distant targets. The distinction is one of range rather than of chemistry.

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