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A neuron can be extremely long despite the surface-to-volume constraint because it is

  • A.able to grow without any plasma membrane at all
  • B.supplied by a circulation of its own internally
  • C.metabolically inactive all along its length
  • D.thin, so no point lies far from the surface

Answer: D

Length alone does not create the problem; bulk does. An axon a metre long may be only a micrometre across, so every point within it remains close to the membrane through which exchange happens. Shape matters here more than overall length.

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