Human Nutrition Lecture 4

Human Nutrition Lecture 4 - Human Nutrition Lecture 4...

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Human Nutrition Lecture 4 Digestion, Absorption, Transport Blood Flow: -most tissues: heart to tissues to heart to lungs to heart -intestines: heart to intestine to liver to heart The Hormonal System When pancreas detects high glucose, secretes insulin and insulin stimulate muscle to uptake glucose and glucagon is the opposite process The Nervous System Digestive system shuts down to prioritize muscles (metabolism speeds up) Mechanical Digestion -mechanical and chemical process -chewing and peristalsis…water added for peristalsis in stomach, small intestine, and you reabsorb water in the large intestine The Muscular Stomach -sphincter, muscle layers, folds ,and pyloric valve Chemical Digestion -salivary enzyme that breaks down starch and little milk fat -stomach: secretes gastric juices (water, enzymes, and HCl) and intitiates protein degradation (proteins unfold (denatured) and clipped into shorter pieces pH Values -see slide Small intestine Bile made in liver and it is responsible for emulsifying your fats Pancreatic juice is secreted for digesting protein, carbohydrate and fat Small intestine produces its own enzymes for digesting protein (di- and tri-peptides) and carbs (disaccharides) but not fat Large Intestine
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This note was uploaded on 05/08/2008 for the course HUMBIO 130 taught by Professor Gardner,c during the Spring '08 term at Stanford.

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Human Nutrition Lecture 4 - Human Nutrition Lecture 4...

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