Biology 5090 · O Level · Circulatory system

Circulatory system — practice question

The diagram illustrates chemicals being exchanged between some cells and a blood capillary. Which substances might P and Q be?

  • AP: amino acids and oxygen; Q: carbon dioxide and maltose
  • BP: carbon dioxide and glucose; Q: alcohol and oxygen
  • CP: carbon dioxide and urea; Q: oxygen and protein
  • DP: glucose and oxygen; Q: carbon dioxide and water

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