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If a nerve impulse crosses a synapse in about 0.5 milliseconds, how many such crossings could occur in one second?

  • A.5,000
  • B.2,000
  • C.500
  • D.200

Answer: B

One second divided by 0.5 milliseconds gives 2,000. The figure is theoretical, since refractory periods limit the rate a real neuron can sustain. Even so, chemical synapses are remarkably fast for a diffusion-based process.

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