© 2006 Plano ISD, Plano, TX

Digestive System a coiled, muscular tube (6-9 meters long) beginning with the mouth and ending with the anus

© 2006 Plano ISD, Plano, TX Digestion process by which food is converted into soluble forms 2 forms of digestion physical chemical

© 2006 Plano ISD, Plano, TX Forms of Digestion Physical Digestion  begins in mouth with saliva  mostly occurs in small intestine Chemical Digestion  begins in mouth by chewing  mechanical breakdown of food into smaller particles  increases surface area of food  chemical breakdown of food by enzymes

© 2006 Plano ISD, Plano, TX Physical Digestion  begins in mouth with saliva Chemical Digestion  begins in mouth by chewing  mechanical  chemical

© 2006 Plano ISD, Plano, TX Stages of Digestion  secretion  digestion  absorption elimination  propels food through system movement  release of digestive juices breakdown of food into molecular sizes food molecules passing through intestinal walls removal of undigested food

© 2006 Plano ISD, Plano, TX Primary Digestive Organs

© 2006 Plano ISD, Plano, TX teeth tongue begin the mechanical breakdown of food - transports food to stomach through the process of peristalsis - transports food to stomach through the process of peristalsis - muscular organ that stores, mixes, digests and controls passage of food mouth esophagus stomach

© 2006 Plano ISD, Plano, TX Peristalsis stomach series of involuntary muscular contractions in the esophagus that squeeze the food down to the stomach food esophagus

© 2006 Plano ISD, Plano, TX - coiled tube from 3 - 6m long, the major site for digestion and absorption of nutrients; contain villi small intestines m long tube, absorbs water from undigested material anus - opening for removal of feces large intestines

© 2006 Plano ISD, Plano, TX Accessory Digestive Organs

© 2006 Plano ISD, Plano, TX - produces bile, which helps break down fats in small intestines - secretes enzymes that break down starches and proteins - stores bile salivary glands - secrete a chemical (enzyme) that breaks down starch into glucose pancreas gall bladder liver

© 2006 Plano ISD, Plano, TX Accessory Digestive Organs connected to stomach by ducts liver pancreas gall bladder

© 2006 Plano ISD, Plano, TX

ulcers spot in stomach lining where cells are destroyed, lining unprotected, irritated by stomach acid gastritis swelling of stomach lining, caused by irritating foods, alcohol, or bacteria acid reflux "back washing" of acid from the stomach into the esophagus; also called heartburn

© 2006 Plano ISD, Plano, TX

© 2006 Plano ISD, Plano, TX 1. mouth esophagus stomach small intestine large intestine anus

© 2006 Plano ISD, Plano, TX salivary glands liver gall bladder pancreas

© 2006 Plano ISD, Plano, TX

© 2006 Plano ISD, Plano, TX

© 2006 Plano ISD, Plano, TX          stomach anus esophagus salivary glands liver small intestine pancreas large intestine gall bladder Match the structure with the number.

© 2006 Plano ISD, Plano, TX          Match the function with the number. produces bile stores undigestible food contains villi mixes and stores food contains enzymes for the first chemical breakdown of food the 4 accessory digestive organs secretes enzymes for starch breakdown transports food by peristalsis major organ for digestion and absorption of nutrients stores bile