You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "where does the hepatic portal vein receive blood from?" whose answer is pancreas.
Each document should contain about 30 words, and these documents should contain useful information.

Query: organs that contribute to the hepatic portal vein
Useful Output:

Doc 1: Portal venous system drains blood from the gastrointestinal tract (apart from the lower section of rectum), spleen, pancreas, and gallbladder to
Doc 2: Your portal vein carries blood from many organs in your abdomen (belly) to your liver. It forms at the juncture of your superior mesenteric
Doc 3: Hepatic portal vein (75%) – supplies the liver with partially deoxygenated blood, carrying nutrients absorbed from the small intestine. This is
Doc 4: Dissection of the hepatic portal venous system, whereby the splenic and superior mesenteric vein converge to form the portal vein.
Doc 5: The other is the portal vein, which delivers blood from your stomach, intestines, and the rest of your digestive system. Featured. What Hepatic