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CAIE A-Level Biology 15.1.7 Rapid Transmission in Myelinated Neurones

Practise explaining myelin insulation, action potentials at nodes of Ranvier and rapid node-to-node depolarisation by local currents during saltatory conduction.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • identify myelin as insulating internodes and preventing membrane ion movement
  • locate voltage-gated channels and action potentials at nodes of Ranvier
  • explain node-to-node local currents as faster saltatory impulse transmission

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