It then proceeds to the small intestine (duodenum and ileum) where most digestion occurs. It is absorbed primarily in the duodenum of the small intestine. Inflammation usually occurs in sections of the jejunum, midsection of the small intestine. The first part of the small intestine is the duodenum. In human anatomy, the intestine (bowel, or gut. An obstruction further down in the intestine or colon will cause delayed vomiting. The last part of the small intestine is the ileum. Absorption of tetracycline occurs in the stomach and the upper small intestine. Resistant starch is starch that escapes digestion in the small intestine of healthy individuals. The cecum marks the division between the small and large intestine. This means that most of their digestion takes place in their large intestine and cecum. The rectum is the last section of the large intestine. Prolonged disease is often characterized by diarrhea along with malabsorption of nutrients in the intestine. Most food digestion takes place in the small intestine. The ascending colon is the first of four main sections of the large intestine.