May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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34Heart CirculationHard1 mark
The thickness of the cardiac muscle in the chambers of the human heart was measured. Chamber W had the thickest muscle, chamber X had thinner muscle than W, and chambers Y and Z had muscle of the same thickness as each other. What is the correct order in which these chambers will contract during the cardiac cycle?