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IB Biology C2.2.2 Resting potential generation

IB Biology C2.2.2 Resting potential generation
IB Biology syllabusBiology SL/HLFirst assessment 2025

Practise explaining how ion movement, membrane charge and the sodium-potassium pump generate and maintain resting potential in neurons.

How this is tested

  • interpret membrane potential graphs, including resting sections and values with correct units
  • explain how sodium and potassium ion movement maintains a negative inside surface
  • outline the sodium-potassium pump using ATP and unequal ion movement across the membrane
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