The graph shows pressure changes during a cardiac cycle. [Graph showing pressure/kPa vs. time/s with curves labeled W, X, Y, Z] Which row correctly identifies W, X, Y, and Z? [Table with columns W, X, Y, Z and rows A, B, C, D with valve states]
✓ Correct Answer
The correct answer is B: W atrioventricular valves close, X semi-lunar valves open, Y semi-lunar valves close, Z semi-lunar valves open
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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