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CAIE A-Level Biology 15.1.12 Sliding Filament Model of Muscle Contraction

Practise sequencing calcium–troponin binding, tropomyosin movement, cross-bridge power strokes and ATP-driven myosin detachment and resetting during contraction.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • sequence calcium binding to troponin and tropomyosin uncovering actin sites
  • explain cross-bridge power strokes, ATP-driven detachment and myosin-head resetting
  • predict contraction changes when calcium availability or ATP hydrolysis is reduced

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