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CAIE A-Level Biology 15.1.8 Refractory Period

Practise linking temporary sodium-channel inactivation after an action potential to one-way propagation and the maximum possible impulse frequency along an axon.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • link temporary sodium-channel inactivation with inability to trigger another action potential
  • explain unidirectional propagation because membrane behind the impulse is refractory
  • connect refractory-period duration with the maximum possible action-potential frequency

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