PPT-Part 1 Food Nutrients: Structure, Function, Digestion, Absorption, and Assimilation

1 Chapter 3 Nutrient Digestion and Absorption 2 Food Nutrient Digestion and Absorption The Digestive Process Digestion mechanical and chemical food breakdown of food for absorption into blood for use storage or chemical change. By Erin and Courtney . . Evolution. Two types of digestion. Intracellular: Break down of macromolecules takes place within the cell.. Extracellular: Break down of macromolecules takes place outside of the cell. digested. ).. The nutrients are then . absorbed. into the . bloodstream. and taken to the cells where they can be used.. Four Digestion processes. Ingestion. Digestion. Absorption. Egestion. Overview!. By: Matt Hanley. Digestive Processes. GI tract. Small Intestine. Large Intestine. Absorption. GI Tract. Mixes food with gastric acid. Digests proteins. HCL acid kills pathogens. Mucus protects inner lining. Water, Electrolytes . and. . Carbohydrates. Gregory J. Bagby, PhD. Rozas Professor of Physiology. CSRB . Rm. 3B9/310. gbagby@lsuhsc.edu. 504-568-6188. GI PHYSIOLOGY. Text for Lectures . Raff and Levitzky. Digestive. -Breaks down and absorbs nutrients. 2. . Respiratory. -absorbs oxygen. 3. . Circulatory. –transports nutrients. 1. Where does the glucose come from?. . Food. 2. Where does the oxygen come from?. Understanding:. The contraction of circular and longitudinal muscle layers of the small intestine mixes the food with enzymes and moves it along the gut. The pancreas secretes enzymes into the lumen of the small intestine. TEKS: 2ABC. http://kidshealth.org/kid/htbw/_bfs_DSmoviesource.html. Digestion. Before your body can use the nutrients in the food you eat, it must go through digestion.. Then nutrients must go through absorption.. mechanical. and . chemical. . processes.. This occurs in the Alimentary Canal…. Alimentary canal . – long muscular tube that runs from the mouth to the . anus. . Peristalsis . – muscular movement of food. BIOMEDICAL IMPORTANCE. Besides water, the diet must provide metabolic fuels (mainly carbohydrates and lipids), protein (for growth and turnover of tissue proteins), fiber (for roughage), minerals (elements with specific metabolic functions), and vitamins and essential fatty acids (organic compounds needed in small amounts for essential metabolic and physiologic functions). . The digestive processes gradually break down the foods eaten until they are in a form suitable for absorption.. For example, meat, even when cooked, is chemically too complex to be absorbed from the alimentary canal.. 267 The digested end products are absorbed into the body through the epithelial liningof the intestinal villi. The undigested food (faeces) enters into the caecum of the largeevents the back flow of t . The absorption and utilization of food by the body is fundamental to nutrition and is facilitated by digestion.. Carbohydrates. Protein. Fat. Vitamines. Minerals and salts. Components of food. Digestion is the complex process of turning the . Dr. . Keshav. Singh. Associate Professor. Department of Zoology. D.D.U Gorakhpur University,. Gorakhpur. Digestion. The . digestive system . of the human body comprises a group of organs working together to convert food into energy for the body. . BASIC FOODS. Carbohydrates, proteins and fats. Cannot be absorbed in native form. Require to be digested to absorbable form. CARBOHYDRATES IN FEED. Mostly Polysaccharides. Some disaccharides also. Di and poly .