A-LevelBiologyGas exchange9700/12 · May/June 2019 · Q341 Mark
The diagram shows some of the effects of nicotine and carbon monoxide in cigarette smoke. [Figure: Venn diagram showing overlapping effects of nicotine and carbon monoxide] Which row is correct?
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.
A1: increase in heart rate, 2: short-term effect on cardiovascular system, 3: combines more readily with haemoglobin than oxygen
B1: increases diameter of small arteries, 2: can cause chronic bronchitis, 3: combines irreversibly with haemoglobin
C1: reduces the oxygen carrying capacity of blood, 2: short-term effect on gas exchange system, 3: reduces the blood supply to hands and feet
D1: stimulates goblet cells to secrete more mucus, 2: highly addictive, 3: increases risk of blood clotting
✓ Correct answer
A: 1: increase in heart rate, 2: short-term effect on cardiovascular system, 3: combines more readily with haemoglobin than oxygen
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