BSC 251 Lecture Notes - Lecture 7: Colorectal Cancer, Common Bile Duct, Glycogen
7 Apr 2016
School
Department
Course
Professor
Document Summary
Read 24. 1, 24. 2, 24. 3, 24. 5, 24. 6, 24. 7, 24. 8, 24. 9, 24. 20, 24. 11, 24. 12, 24. 13. Digestive system consists of: the digestive tract (gi tract) and accessory organs. 24. 2 functions of the digestive system: ingestion eating and drinking: mechanical processing happens immediately after ingestion; break down large food products into small pieces of the same substance. There are four major layers of the digestive tract that are possible: mucosa inner lining. Muscularis mucosa band of smooth muscle located in the lamina propria, contraction alter the shape of the inner lining of the gi tract. Helps regulate some secretions and motility(movement through) of the digestive tract. Exocrine cells deep within wall of submucosa: muscularis externa. Spindle shaped which orients cells differently; longitudinal layer (of muscle tissue) and circular layer (of muscle tissue); they squeeze the lumen to help push contents down the tract in the proper direction. Assists in mechanical processing the mixing of contents with gastric juices and squeezing them: serosa.
