Digestive System IIII. Large IntestineA. Supported by a peritoneal membrane = Mesocolon B. 4 divisions to Large Intestine 1. Cecum - appendix attached here; ileocecal valve 2. Colon: 4 sections – Ascending, Transverse, Descending, Sigmoid 3. Rectum 4. Anal canal a. Internal sphincter = smooth muscle b. External sphincter = skeletal muscleC. Histology of Colon: 1. mucosa – simple columnar 2. submucosa - c.t. 3. muscularis – contains an inner circular layer; outer longitudinal layer of muscle is organized into 3 strips of smooth muscle called Teniae Coli 4. Serosa- simple quamous + connective tissueD. Primary function = absorption of water II. Accessory organsA. Liver - 4 lobes; right, left, caudate, & quadrate. Supported by a peritoneal membrane = Falciform Ligament 1. Histology: Each lobe is divided into lobules; a. Hepatic Triad – branches of hepatic artery, portal vein & bile duct. Liver pancreas produces bile (fat emulsifier) b. Central Vein 2. Function in regard to the digestive system is to producebile (fat emulsifier) B. Gall bladder – attached to liver; stores and concentrates bile C. Pancreas: it has a population of cells referred to as Acinar cells.These cells secrete digestive enzymes (5 different ones) that collectively complete the digestion of carbohydrates, lipids, and proteins. These are transported to the duodenum via the pancreatic
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