A-LevelBiologyGas exchange9700/12 · May/June 2020 · Q331 Mark
Carbon monoxide, nicotine and tar are components of tobacco smoke. Which row correctly describes their effect on a smoker's body? [Figure 33.1]
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Acarbon monoxide: causes loss of consciousness at very low concentrations, nicotine: increases the diameter of blood vessels, tar: destroys cilia on cells lining the airways
Bcarbon monoxide: forms a stable compound with haemoglobin, nicotine: increases blood pressure, tar: stimulates goblet cells to secrete mucus
Ccarbon monoxide: forms carbaminohaemoglobin, nicotine: increases the diameter of the coronary artery, tar: settles on cells lining the airways
Dcarbon monoxide: forms carboxyhaemoglobin, nicotine: decreases the heart rate, tar: contains carcinogens
✓ Correct answer
B: carbon monoxide: forms a stable compound with haemoglobin, nicotine: increases blood pressure, tar: stimulates goblet cells to secrete mucus
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