When a person suffers an asthma attack, the tubes of the gas exchange system narrow and extra mucus is produced.
Which of these changes occur during an asthma attack?
1 Activity of ciliated epithelium increases.
2 Endocytosis in goblet cells increases.
3 Smooth muscles more active.
1 )
1 and 2 only
1 and 3 only
3 )
2 and 3 only
4 )
1, 2 and 3
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