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CAIE A-Level Biology 8.3.3 Cardiac Cycle and Valve Action

Practise identifying systole and diastole on pressure graphs, opening or closing valves from pressure differences and linking chamber volume to blood movement.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • identify atrial systole, ventricular systole and diastole from pressure changes
  • open or close each valve from the pressure difference across it rather than timing alone
  • connect chamber contraction, volume change and blood movement with features on the graph

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