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CAIE A-Level Biology 15.1.5 Action Potential Sequence

Practise sequencing threshold, sodium influx, depolarisation, potassium efflux, repolarisation and hyperpolarisation, then explain local currents into adjacent membrane.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • open voltage-gated sodium channels at threshold and trace sodium influx during depolarisation
  • close sodium channels and trace potassium efflux during repolarisation and overshoot
  • explain local circuit currents depolarising the adjacent unmyelinated axon membrane

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