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IB Biology HL C2.2.3 Nerve Impulses As Action Potentials Questions

Practise IB Biology HL 2.2.3 by analysing action-potential location, initiation and membrane-potential data.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how sodium influx depolarizes the membrane and potassium efflux repolarizes it during an action potential.
  • Describe how an action potential propagates along a nerve fibre and identify its axonal location.
  • Interpret threshold and all-or-none evidence for action-potential initiation.

IB Biology HL C2.2.3 Nerve Impulses As Action Potentials Questions question 1

[Maximum number: 1]

Neurons transmit electrical impulses. Which statement describes part of this process?

A

K+\mathrm{K}^{+}ions are pumped out of the cell to depolarize the membrane.

B

Ion channels let K+\mathrm{K}^{+}diffuse into the cell to depolarize the membrane.

C

Na+\mathrm{Na}^{+}ions are pumped into the cell to repolarize the membrane.

D

Ion channels let Na+\mathrm{Na}^{+}diffuse into the cell to depolarize the membrane.

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