Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

The diagram illustrates an alveolus. The arrows show how gases move. Which row is correct?

  • A1 oxygen, 2 carbon dioxide, 3 air
  • B1 air, 2 carbon dioxide, 3 oxygen
  • C1 air, 2 oxygen, 3 carbon dioxide
  • D1 carbon dioxide, 2 oxygen, 3 air

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