FSCN 1012 Lecture Notes - Lecture 4: Gastric Inhibitory Polypeptide, Vagus Nerve, Portal Vein

• School: UMN
• Department: Food Science and Nutrition
• Course: FSCN 1012
• Professor: Reneta Korczak

Document Summary

Digestive process: controlled by the autonomic nervous system, digestion hydrolyzes complex molecules into simpler substances for absorption, self-regulating processes within the digestive tract largely control the liquidity, mixing, and transit time of the digestive mixture. Hormones control digestion: four hormones regulate digestion, gastrin, secretin, cholecystokinin (cck, gastric inhibitory peptide. Functions of the digestive system: digestion, process of breaking down foods into a form the body can use, absorption, uptake of nutrients from the gi tract into the blood or lymph, excretion of waste matter. The mouth and esophagus: mouth, chewing or mechanical digestion alters food in the mouth, easier to swallow. Increases the accessibility to enzymes: esophagus, connects the pharynx to the stomach. Intestinal contractions: 1-3 days for foods to leave the gi tract, segmentation: intermittent contractions and relaxations of the intestinal wall"s circular smooth muscle, gives digestive juices time to mix with food, gallbladder and pancreas secrete digestive juices.