A-LevelBiologyGas exchange9700/12 · Feb/Mar 2017 · Q371 Mark

Which of these statements could describe the effect of carbon monoxide in cigarette smoke? 1 It binds irreversibly to haemoglobin. 2 It causes mucus to accumulate in the bronchioles. 3 It results in more carbon dioxide being transported in the blood. 4 It temporarily increases the heart rate.

A1 and 2

B1 only

C2 and 3

D3 and 4

✓ Correct answer

B: 1 only

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2017 Paper 1 Variant 2, question 37.

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