O-LevelBiologyRespiration5090/11 · May/June 2015 · Q181 Mark

The diagram shows a section of an alveolus and a capillary in a lung. [Figure 18.1] What are the relative concentrations of carbon dioxide at X, Y and Z?

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AX: high, Y: high, Z: high

BX: high, Y: low, Z: low

CX: low, Y: high, Z: high

DX: low, Y: high, Z: low

✓ Correct answer

B: X: high, Y: low, Z: low

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2015 Paper 1 Variant 1, question 18.

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