What is the name of the lower part of the small intestine?

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The lower part of the small intestine is known as the ileum. This section is crucial for the final stages of digestion and nutrient absorption. It follows the jejunum and is typically about three to four meters long in adults. The ileum absorbs nutrients such as vitamin B12 and bile acids, which are vital for various metabolic processes in the body.

In contrast, the duodenum, which is the first section of the small intestine, primarily functions in the initial stages of digestion by receiving chyme from the stomach along with bile from the liver and pancreatic juices. The cecum is considered part of the large intestine and serves as a pouch connecting the small intestine to the colon. The colon, being the main part of the large intestine, is responsible for water absorption and the formation of feces. Understanding the distinctions and functions of these different sections helps clarify why the ileum is identified as the lower part of the small intestine.