Biology 9700 · AS & A Level · The gas exchange system

The gas exchange system — practice question

When a person has an asthma attack, the tubes in the gas exchange system become narrower and more mucus is formed. Which changes take place during an asthma attack?

  • A1, 2 and 3
  • B1 and 2 only
  • C1 and 3 only
  • D2 and 3 only

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