The nervous system generates the most marks in CB2, and this pack is built around the 6-mark Level of Response question on motor neurone specialisation that appears in both the standard and higher Edexcel papers.

The Topic Mastery Sheet presents all three neurone types with their structural features and functions, gives a complete part-by-part breakdown of neurone anatomy, and explains the myelin sheath mechanism precisely. The error box corrects the most persistent misconception about myelin’s role.

The Student Exam Practice Sheet (20 marks) covers: CNS naming, receptor function, sensory vs motor distinction, myelin structure and function, a Higher Tier brain-mass ratio calculation, and the full 6-mark LoR motor neurone question with Level descriptor rubric.

The Teacher Answer Key reproduces the complete Level 3 indicative content from the official mark scheme in examiner language.

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