BIO 263 Lecture Notes - Lecture 8: Cecum, Omeprazole, G Cell
Digestive System
Abdominal Quadrants
Digestive Organs to Know: stomach, small intestine, cecum, appendix, colon (large intestine)
Lumen: the open space in the
digestive tract
Mouth: has stratified squamous to
protect from food (mucosa layer)
Enhancing surface area
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Document Summary
Digestive organs to know: stomach, small intestine, cecum, appendix, colon (large intestine) Lumen: the open space in the digestive tract. Mouth: has stratified squamous to protect from food (mucosa layer) Peristalsis describes the waves of contracting muscularis smooth muscle to move food down the digestive tract. Segmentation is an entirely different pattern of muscle contraction. Coordinating all the muscle requires ~500,000,000 neurons (more than in brain of a squirrel) Stomach makes hydrofluoric acid which mixes with food in digestion. G cells secrete a hormone (gastrin) that stimulates parietal cells. Nexium, prevacid, prilosec all block acid pumps. Rectum & anal canal - end of digestive tract. Food enters cecum and moves through large intestine, absorbs water. Diarrhea due to not absorbing water (i. e. cholera) thus dehydration. Upper stomach is divided- new pouch is formed about the size of a golf ball. Pouch is attached to the jejunum ( jejunum is also divided) via roux limb.