Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

What is one reason that oxygen diffuses from an alveolus in the lungs into the blood?

  • AThe oxygen concentration in the alveolus is greater than the carbon dioxide concentration in the blood.
  • BThe oxygen concentration in the alveolus is greater than the oxygen concentration in the blood.
  • CThe oxygen concentration in the blood is greater than the oxygen concentration in the alveolus.
  • DThe oxygen concentration in the blood is greater than the carbon dioxide concentration in the alveolus.

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