Biology 9700 · AS & A Level · The microscope in cell studies

The microscope in cell studies — practice question

When a person has an asthma attack, the tubes in the gas exchange system become narrower and more mucus is produced. Which of these changes happen during an asthma attack?

A1 and 2 only
B1 and 3 only
C2 and 3 only
D1, 2 and 3

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