IB Biology HL 2.2.1 Neurons Question Bank
Practise IB Biology HL 2.2.1 by relating sensory, relay and motor neuron structures to reflex arcs and impulse transmission.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Relate sensory, relay and motor neuron structures to CNS pathways, reflex arcs and impulse transmission.
- Interpret neuron diagrams and statements to identify cell locations and information flow in a reflex circuit.
C2.2.1—Neurons question 1
[Maximum number: 4]
Draw a labeled diagram to show the structure of a motor neuron.
Award [1] for each of the following correctly drawn and labelled: cell body and nucleus - star shaped body with nucleus inside; dendrites - as multiple long/narrow protrusions from the cell body; axon - at least three times as long as the cell body not including the dendrites; myelin sheath/Schwann cells and nodes of Ranvier - sheath with gaps/narrowings; motor end plates - shown as widened ends of multiple branches of the nerve fibre; Reject the points for axon and myelin sheath if the labelling line does not clearly point to the structure.
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