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.
1 )
1, 2 and 3
2 )
1 and 2 only
1 and 3 only
4 )
2 and 3 only
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