Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

The diagram shows a section of the human gas exchange system. Which row correctly identifies P, Q and R?

  • AP: alveolus wall; Q: capillary wall; R: vein
  • BP: bronchiole; Q: alveolus wall; R: capillary
  • CP: capillary; Q: layer of moisture; R: bronchiole
  • DP: alveolus wall; Q: bronchiole; R: capillary

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