Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

The diagram illustrates 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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