Biology 5090 · O Level · Excretion

Excretion — practice question

The diagram shows the blood supply to the liver and kidneys. Which vessels carry blood with the highest and lowest urea concentrations?

  • Ahighest: 1; lowest: 2
  • Bhighest: 1; lowest: 4
  • Chighest: 3; lowest: 2
  • Dhighest: 3; lowest: 4

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