Biology 5090 · O Level · Human gas exchange

Human gas exchange — practice question

The diagram illustrates part of an alveolus together with a capillary in a lung. What are the relative concentrations of carbon dioxide at X, Y and Z?

  • AX high, Y high, Z high
  • BX high, Y low, Z low
  • CX low, Y high, Z high
  • DX low, Y high, Z low

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