Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

A person lives in a climate where the air contains very little water vapour. Which row gives the correct comparison between inspired air and expired air for this person?

  • Ainspired air: higher carbon dioxide concentration; expired air: higher oxygen concentration
  • Binspired air: lower water vapour concentration; expired air: higher carbon dioxide concentration
  • Cinspired air: lower oxygen concentration; expired air: higher water vapour concentration
  • Dinspired air: lower carbon dioxide concentration; expired air: lower water vapour concentration

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