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IB Biology SL C2.2.4 Variation in Impulse Speed Questions

Practise IB Biology SL 2.2.4 by explaining how myelin and axon diameter affect impulse transmission.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify myelin sheath and node structures on an axon diagram.
  • Relate increasing axon diameter and myelin structure to faster impulse transmission.

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Study C2.2.4—Variation in impulse speed conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL C2.2.4 Variation in Impulse Speed Questions question 1

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Scientists used MRI to calculate the speed of transmission of nerve impulses along axons of brain neurons.

Figure for Question IB Biology SL C2.2.4 Variation in Impulse Speed Questions question 1 — IB Biology SL

Describe the relationship between speed of transmission and axon diameter.

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