A-LevelBiologyCell structure9700/12 · May/June 2011 · Q51 Mark

A human aorta has a lumen width of 2 cm. A human red blood cell has a diameter of 7 µm. How many red blood cells could be laid end to end across the diameter of the aorta lumen?

A2.9 × 10-3

B2.9 × 10-2

C2.9 x 102

D2.9 × 103

✓ Correct answer

D: 2.9 × 103

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Topic: Cell structure, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2011 Paper 1 Variant 2, question 5.

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