NURS 2820U Lecture Notes - Lecture 5: Food Intolerance, Mucosa-Associated Lymphoid Tissue, Physical Examination
Document Summary
Muscularis mucosa longitudinal and circular and increasing surface area. Top layer of mucosa is the glands and provide more efecive (smooth muscle) which divide to layers for funcion of contracion vessels are present (smooth muscle) Mechanical digesion: churning: contracion alows breaking down of food and mix food with enzyme and juices to further break down the food. Intrinsic factor (if): promote vitamin b12 absorpion in intesine for rbc producion. If this goes down, person becomes anemic: chief cells: Pepsinogen: acivated by hydrochloric acid to become pepsin that breaks down pepide or proteins. Should be in inacive form so the stomach wall is not broken down. Lipase: breaks down lipids: mucus neck cells: produce mucus for protecion against acidic contents. Gastric ph ater a meal: 1-4 (stomach only organ that has the lowest ph) -> can be altered depending on the gastric content. Defense mechanisms: layer of mucus and bicarb provides bufer to stop pepsin difusion into mucosal layer.
