A-LevelBiologyGas exchange9700/12 · Oct/Nov 2011 · Q341 Mark
Which observation would indicate a difference between the structure of the gas exchange system of a cigarette smoker and a non-smoker?
Athe absence of ciliated epithelium in the bronchioles
Bthe decrease in elastic fibres in the bronchioles
Cthe enlargement of goblet cells in the bronchi
Dthe increase in smooth muscle
✓ Correct answer
C: the enlargement of goblet cells in the bronchi
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