A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2013 · Q291 Mark

The diagram shows a defect in the walls between the atria. [Figure 29.1] What effect would this defect have on the blood circulatory system?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Aincreased pressure in the pulmonary artery

Birregular heart beat

Creduced oxygen saturation of haemoglobin

Dventricular systole is delayed

✓ Correct answer

C: reduced oxygen saturation of haemoglobin

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2013 Paper 1 Variant 2, question 29.

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