The graph shows the pressure changes in the left atrium, left ventricle and aorta during one cardiac cycle. [Figure 30.1] With reference to the semilunar valve and atrioventricular valve, what is happening at points 1, 2, 3 and 4?
✓ Correct Answer
The correct answer is B: semilunar valve opens: 1, semilunar valve closes: 2, atrioventricular valve opens: 4, atrioventricular valve closes: 3
📋 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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