The term "ileo" refers to the ileum, which is the final section of the small intestine in the human digestive system. It connects to the large intestine at the cecum and plays a crucial role in absorbing nutrients, vitamins, and bile acids from digested food. The ileum is approximately 3 to 4 meters long and is lined with villi, tiny finger-like projections that increase the surface area for absorption. In addition to nutrient absorption, the ileum also helps in the immune response by containing lymphoid tissue known as Peyer's patches. These patches monitor intestinal bacteria and prevent the growth of harmful microorganisms. Proper functioning of the ileum is essential for overall digestive health and nutrient balance in the body.