A-LevelBiologyTransport in mammalsFeb/Mar 2019Paper 1 Q321 Mark
The statements list some of the events in the cardiac cycle. They are not in the correct order. 1 The impulse travels through Purkyne tissue. 2 The ventricles contract. 3 The atrioventricular node delays the impulse for a fraction of a second. 4 The muscle tissue of the sinoatrial node contracts. 5 The wave of excitation sweeps upwards from the base of the ventricles. 6 A wave of excitation sweeps across the atria. 7 The atria contract. Which statement describes the second of these events to occur in the cardiac cycle?
A1
B4
C6
D7
✓ Correct Answer
The correct answer is C: 6
📋 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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