A-LevelBiologyTransport in mammalsFeb/Mar 2022Paper 1 Q311 Mark
Blood entering the heart from the vena cava passes through, or past, several structures before entering the lungs. Five of these structures are included in this list. atrioventricular node aorta semilunar valve left atrium pulmonary vein Purkyne tissue sinoatrial node pulmonary artery After arranging these five structures in the correct order of blood flow from the vena cava to the lungs, which structure will be third?
Aatrioventricular node
BPurkyne tissue
Csemilunar valve
Dsinoatrial node
✓ Correct Answer
The correct answer is B: Purkyne tissue
📋 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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