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?

Q: What is the correct answer to this A-Level Biology question?

The correct answer is B: both atria then both ventricles.

Q: What topic does this question test?

This question tests Transport in mammals in A-Level Biology (syllabus code 9700). It is worth 1 mark.

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: both atria then both ventricles

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Transport in mammals in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2021 examination, Paper 1 Variant 2.

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