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IB Biology SL C2.2.2 Resting Potential Generation Questions

Practise IB Biology SL 2.2.2 by explaining how ion pumps maintain resting potential in neurons.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Define resting potential and state its approximate membrane-potential value (about −70 mV).
  • Explain how the sodium-potassium pump uses ATP to move 3 Na⁺ out and 2 K⁺ in, maintaining axon ion gradients and polarization.

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Study C2.2.2—Resting potential generation conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL C2.2.2 Resting Potential Generation Questions question 1

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The diagram below shows a motor neuron.

Figure for Question IB Biology SL C2.2.2 Resting Potential Generation Questions question 1 — IB Biology SL

Define resting potential.

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