The
hepatic portal vein is a
blood vessel that conducts blood from the
gastrointestinal tract and
spleen to the
liver. This blood is rich in nutrients that have been extracted from food, and the liver processes these nutrients; it also filters toxins that may have been ingested with the food. 75% of total liver blood flow is through the hepatic portal vein, with the remainder coming from the
hepatic artery proper. The blood leaves the liver to the heart in the
hepatic veins.