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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.

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

[Maximum number: 1]

The diagram below shows a motor neuron.

Motor-neuron drawing ending on muscle fibres. I points to the dark oval in the cell body, II to the long central fibre, III to a segmented covering and IV to branches extending from the cell body. Blank label lines accompany I–IV.

Define resting potential.

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