Which vessel carries absorbed nutrients from the small intestine to the liver for detoxification first?

• A. Aorta
• B. Hepatic Portal Vein
• C. Renal Vein
• D. Pulmonary Artery

Answer: (B)

The key idea is that nutrient-rich blood from the digestive tract takes a special route to the liver before circulating elsewhere. After absorption in the small intestine, nutrients enter the hepatic portal circulation, so the blood is directed first to the liver via the hepatic portal vein. This arrangement allows the liver to detoxify harmful substances, metabolize nutrients, and regulate blood glucose and other metabolites before the blood mixes with the general circulation. The hepatic portal vein collects blood from the intestinal capillaries (via veins like the superior mesenteric and splenic veins) and channels it to the liver’s sinusoids for processing. In contrast, the aorta carries oxygenated blood to tissues, the renal vein drains the kidneys, and the pulmonary artery carries blood to the lungs, so they do not deliver absorbed gut contents to the liver first.