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secondary 4 Biology Singapore

Can someone please explian to me how to derive the answer for question 21?

Date Posted: 5 years ago

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The renal artery carries blood to the kidney, while the renal vein carries blood, now with far lower concentrations of urea and mineral ions, away from the kidney. The urine formed passes down the ureter to the bladder. The liver converts ammonia to urea, which is excreted in urine by the kidneys.
Therefore, concentration of urea increases in this sequence:
Renal vein

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Date Posted: 5 years ago

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Renal vein, renal artery, ureter

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