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Nutrient digestion in the small intestine regulated

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Unformatted text preview: luence of small intestine • Cholecystokinin (CCK) How Does the GI Tract Coordinate Functions to Optimize Digestion & Nutrient Absorption? Nutrient • Small intestine • Chemical digestion and nutrient absorption • Regions • Duodenum, jejunum, and ileum • Lining of small intestine • Plica circulares • Villi – Enterocytes • Microvilli • Lacteal Overview of the SI and Accessory Organs Absorptive Surface of the Small Intestine Intestine How Does the GI Tract Coordinate Functions to Optimize Digestion & Nutrient Absorption? Nutrient • Digestion in the small intestine • Regulated by hormones • Secretin and CCK • Pancreatic juice • Bile • Produced in liver; stored in gallbladder • Digestion of fatty foods • Enterohepatic circulation • Enzyme facilitation The Pancreas The The Role of the Liver and Gallbladder in Digestion Gallbladder How Does the GI Tract Coordinate Functions to Optimize Digestion & Nutrient Absorption? Nutrient • Nutrient absorption • Passive and active transport mechanisms • Stomach absorption • Small intestine absorption • Entry into and exit from enterocyte • Bioavailability • Influential factors Nutrient Absorption and Circulation Circulation How Does the Body Circulate Nutrients & Eliminate Cellular Waste Products? Products? • Transport • Circulatory system • Absorption from small intestine • Water-soluble nutrients • Circulate to liver in bloodstream How Does the Body Circulate Nutrients & Eliminate Cellular Waste Products? Products? • Cardiovascular system • Two loops • Systemic circulation • Delivers blood to all the body’s organs except lungs • Capillaries • Exchange of materials, nutrients, and gases • Arterial and venous vascular systems •...
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