The duodenum receives partly-digested food, acid, and bile. The jejunum and ileum break down food fully. ● The pH of within the small intestine is 6. This pH is maintained through bicarbonate ions. ● Bile and pancreatic enzymes enter the small intestine through the duodenum. ● The pathway of food through the intestines is: duodenum ->jejunum -> ileum ->cecum ->colon ->rectum ● The enzymes that act inside the small intestine are amylase, protease, and lipase. Amylase acts on starch and breaks it down into small carbohydrate molecules. Protease acts on proteins and breaks them down into amino acids. Lipase breaks down dietary fats into smaller molecules called fatty acids and glycerol. Large Intestine ● In relation to digestion, the large intestine absorbs water and salts. It also stores waste material until they're thrown out of the body. ● The three sections of the large intestine are the cecum, colon, and rectum. The cecum takes digested liquid from the ileum and passes it on to the colon. The colon is the principal place for water reabsorption and absorbs salts when needed. The rectum is where leftover waste sits until it is ready to be emptied through the anus. ● The large intestine helps the body digest and remove water from the remains of food (feces) after which it will go through the rectum.
Pancreas ● The pancreas is about six inches long and is located in the abdomen.
- Fall '19