the hepatic portal system is composed of blood vessels that bring
Hepatic portal system The portal venous system is responsible for directing blood from parts of the gastrointestinal tract to the liver. Substances absorbed in the small intestine travel first to the liver for processing before continuing to the heart. Not all of the gastrointestinal tract is part of this system. The system extends from about the lower portion of the esophagus to the upper part of the anal canal. It also includes venous drainage from the spleen and pancreas.
Liver The liver is a vital organ only found in vertebrates.[2][3] In humans, it is located in the upper right quadrant of the abdomen, below the diaphragm. The liver has a wide range of functions, including detoxification of various metabolites, protein synthesis, and the production of biochemicals necessary for digestion.[4] It also plays a role in metabolism, regulation of glycogen storage, decomposition of red blood cells and hormone production.[4]