THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The ileum is the last and longest section of the small intestine. Here the walls of the small intestine begin to thin and narrow, and blood supply is reduced. Food spends the most time in the ileum, where the most water and nutrients are absorbed.

Detailed explanation-2: -A special type of cell helps nutrients pass through the gut lining and into circulation. The small intestine has a vast interior surface area, which makes it good for absorption. This is created by the plicae circulares, which project numerous microscopic tissue structures that resemble fingers and are known as villi.