FSCN 1012 Lecture Notes - Lecture 7: Gastric Inhibitory Polypeptide, Portal Vein, Autonomic Nervous System
7 Mar 2020
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Document Summary
Digestion hydrolyzes complex molecules into simpler substances for absorption. Self-regulation processes within the digest tract largely controls the liquidity, mixing and transit time. Includes the esophagus, gallbladder, liver, stomach, pancreas, small intestine, large intestine, rectum and anus. Surrounded by connective tissue mesentery that weaves around. Contains a diffuse network of capillaries that transports absorbed nutrients via the hepatic portal vein that goes to the liver. Process of breaking down foods into a from the body can use. Uptake of nutrients from the gi tract into the blood or lymph. Chewing or mechanical digestion alters food in the mouth. Involves progessive, recurring waves of smooth muscle contractions that compress and squeeze the gi tract. Act as valves that regulate passage or flow of material through the gi tract. Respond to stimuli from nerves, hormones, and hormone like substances and an increase in pressure. Temporary holding tank for partially digested food before moving it tino the small intestine.
