Biology 5090 · O Level · Human gas exchange

Human gas exchange — practice question

The diagram illustrates an alveolus and a blood capillary. Which row names the letters P, Q and R?

  • AP: carbon dioxide, Q: oxygen, R: red blood cell
  • BP: carbon dioxide, Q: oxygen, R: white blood cell
  • CP: oxygen, Q: carbon dioxide, R: red blood cell
  • DP: oxygen, Q: carbon dioxide, R: white blood cell

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