THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -These sections are called the duodenum, jejunum, and ileum. The inner tube or lumen of the small intestinal wall is wrinkly with circular folds and covered with shaggy hairs called villi and microvilli, where nutrients are absorbed into a network of capillaries and lacteals.

Detailed explanation-2: -Ileum: This last section is the longest part of your small intestine. The ileum is where most of the nutrients from your food are absorbed before emptying into the large intestine.

Detailed explanation-3: -Villi that line the walls of the small intestine absorb nutrients into capillaries of the circulatory system and lacteals of the lymphatic system. Villi contain capillary beds, as well as lymphatic vessels called lacteals. Fatty acids absorbed from broken-down chyme pass into the lacteals.

Detailed explanation-4: -Tiny hair-like projections that line the inside of the small intestine. They contain blood vessels and help absorb nutrients.