Which vessel is the largest conduit delivering blood to the liver from the GI tract as part of the hepatic portal system?

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In the hepatic portal system, blood from the GI tract is collected by veins that drain the gut and then flow together into a single vessel that delivers that nutrient‑rich blood to the liver. The main conduit doing this is the hepatic portal vein. It is formed by the union of major tributaries, especially the splenic vein and the superior mesenteric vein, and it carries blood straight to the liver for processing. After the liver processes the blood, it leaves via hepatic veins into the inferior vena cava, which then returns it to the heart. The inferior vena cava itself isn’t delivering blood from the GI tract to the liver; it’s a systemic vein that carries blood away from the liver after processing. The splenic vein and superior mesenteric vein are important tributaries feeding into the portal vein, but the single, largest conduit delivering GI‑tract blood to the liver is the hepatic portal vein.