BIOL-242 Lecture Notes - Lecture 42: Antiporter, Parietal Cell, Blood Plasma
10 Jun 2020
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Chapter 23 part 4 |function anatomy - the stomach. Parietal cells pump h+ (from carbonic acid breakdown) into stomach lumen. K+ goes into cells to balance charge. Hco3 from carbonic acid breakdown blood (via cl and hco3 antiporter) Blood leaving stomach more alkaline alkaline tide. Cl (from blood plasma via antiporter) follows h+ hcl. Activate sympathetic fibers tightening of pyloric sphincter no more food entry to small intestine. Decreased gastric activity protects small intestine from excessive acidity. Secretin, cholecystokinin (cck), vasoactive intestinal peptide (vip) If small intestine pushed to accept more chyme dumping syndrome. Common in gastric reduction for weight loss. Neural and hormonal mechanisms that regulate release of gastric. There are two stimulatory events for the cephalic phase. Firstly, the sight and thought of food which stimulates the cerebral cortex, the hypothalamus, and then the medulla oblongata, which then stimulates the vagus nerve to start stomach secretory activity.
