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In mammals, which blood vessel would normally carry largest amount of urea?

1. Renal Vein
2. Dorsal Aorta
3. Hepatic Vein
4. Hepatic Portal Vein

Correct answer: Hepatic Vein

Solution

Urea is synthesized in the liver from ammonia via the urea cycle, so blood leaving the liver contains the highest urea concentration. Therefore, the hepatic vein normally carries the largest amount of urea.

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