What is the largest vessel of the hepatic portal system?

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In the hepatic portal system, the main flow of venous blood from the abdominal organs to the liver is carried by a single, large vessel—the hepatic portal vein. It collects nutrient-rich blood from the GI tract via the splenic vein and the superior mesenteric vein (with other tributaries) and delivers it to the liver for processing. The inferior vena cava is the major systemic vein returning blood to the heart, not part of this portal circuit. The splenic artery is an artery, not a vein, and the superior mesenteric vein is a major contributor but feeds into the hepatic portal vein rather than being the main conduit itself. So the hepatic portal vein is the largest vessel in the hepatic portal system because it serves as the primary channel delivering all portal blood to the liver.