with microvilli (secretion and absorption) and goblet cells (mucus) b. Lamina propria – contains lacteals (lymphatic capillaries) c. Muscularis mucosae Between villi = intestinal glands (crypts of Lieberkuhn) 2. Submucosa is thrown up into folds = Plicae Circularis (macroscopic) . 3. Muscularis - 2 layers of smooth muscle; outer longitudinal layer and inner circular layer 4. Serosa Digestive System II Notes Continued from 1 April 2013 C. Function 1. Duodenum: most chemical digestion occurs here because; a. the duodenal cells of the intestinal glands make enzymes to break down food. b. it receives bile from the gall bladder. c. it receives enzymes from the pancreas for the breakdown of food BILIARY APPARATUS Common Bile Duct Pancreatic (from gall bladder Duct and liver)
Hepatopancreatic ampulla (surrounded by the hepatopancreatic sphincter) Duodenal papilla (volcano shaped) Duodenum 2. Jejunum – most absorption occurs here 3. Ileum: has very little absorption. Most Chemical Digestion occurs in the duodenum and digestion is completed in Small Intestine. The small intestine ends at the Ileocecal valve . Which of the following contains 3 layers of smooth muscle in its muscularis? a. Stomach b. Small intestine c. Large intestine d. Esophagus e. Pharynx
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