KINS 1224 Chapter Notes - Chapter 25: The Fluid, Muscular Layer, Migrating Motor Complex
Document Summary
Nearly all chemical digestion and nutrient digestive occur in the small intestine. The small intestine is the longest part of the digestive tract. Divided into 3 regions the duodenum, jejunum, and ileum. The duodenum receives stomach content, pancreatic juice, and bile. Stomach acid is neutralized here, fats are physically broken up (emulsified) by the bile acids, pepsin is inactivated by the elevated ph, and pancreatic enzymes take over the job of chemical digestion. The jejunum has large tall closely spaced circular folds. Its wall is thick and muscular and it has an especially rich blood supply which gives it the red color. The ileum has a thinner, less muscular, less vascular wall. The ileum has prominent lymphatic nodules called peyer patches. It regulates the passage of food reside in the large intestine and prevents feces from backing up into the ileum. The largest folds of the intestinal wall are transverse to spiral ridges called circular folds.
