A-LevelBiologyTransport in mammalsMay/June 2021Paper 1 Q271 Mark
The sinoatrial node initiates the cardiac cycle. What is the correct order in which the chambers of the heart contract?
Aatria and ventricles at the same time
Bboth atria then both ventricles
Cleft atrium, then left ventricle, then right atrium, then right ventricle
Dright atrium, then right ventricle, then left atrium, then left ventricle
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of transport in mammals within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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