Senior Bio Notes Pt 6.docx - a Mechanical digestion and propulsion contractions accomplish not only stomach empty-ing but also pressing kneading

Senior Bio Notes Pt 6.docx - a Mechanical digestion and...

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a. Mechanical digestion and propulsion - contractions accomplish not only stomach empty-ing, but also pressing, kneading, twisting, and continual mixing of food with gastric secretions to form chyme. b. Response of the stomach to filling the walls can stretch to accommodate the increasing volume until ~1 liter is ingested. c. Gastric contractile activity = rippling movements in the stomach gently mix food with gastric secretions; peristaltic contractions become much more powerful and rapid as they reach the pylorus. d. Regulation of gastric emptying = pyloric sphincter separates the pylorus from the duodenum and regulates the release of chyme - one squirt at a time; usually emptied completely within four hours after a meal; fluids pass faster than solids / carbohydrate faster than fats. e. Chemical digestion - protein digestion is initiated as the zymogen (inactive enzyme or enzyme precursor) pepsinogen is converted pepsin by HCL molecules; rennin is produced by the gastric glands of infants to work on milk
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