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IB Biology SL C2.2.1 Neurons Questions

Practise IB Biology SL 2.2.1 by labelling motor-neuron structures and linking neuron parts to impulse direction and effector control.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Label neuron structures including cell body, dendrites, axon, myelin sheath and nodes of Ranvier.
  • Distinguish sensory, relay and motor neuron functions by impulse direction and CNS/effector connections.

IB Biology SL C2.2.1 Neurons Questions question 1

[Maximum number: 2]

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.

Label the structures indicated by the numbers I-IV.

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