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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