Why does nutrient-rich blood of the hepatic portal vein pass first through the liver before this blood is returned to the heart?
A. This allows the liver to add more nutrients to the blood.
B. This allows the liver to add more waste products to the blood.
C. The liver needs more nourishment than other tissues; hence nutrients first pass through the liver.
D. This allows the liver to store or modify the nutrients.
Answer: D
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