A-LevelBiologyGas exchange9700/12 · Oct/Nov 2021 · Q351 Mark
When a person suffers an asthma attack, the tubes of the gas exchange system narrow and extra mucus is produced. Which changes occur during an asthma attack? 1 Activity of ciliated epithelium increases. 2 Endocytosis in goblet cells increases. 3 Smooth muscles are more active.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct answer
C: 1 and 3 only
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