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© 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 Breaking down of food so the body can use it. 2 forms of digestion physical © 2006 Plano ISD, Plano, TX chemical Forms of Digestion Physical Digestion Chemical Digestion mechanical chemical breakdown of food breakdown of food into smaller particles by enzymes begins in mouth by chewing begins in mouth with saliva increases surface area of food mostly occurs in small intestine © 2006 Plano ISD, Plano, TX Physical Digestion mechanical begins in mouth by chewing © 2006 Plano ISD, Plano, TX Chemical Digestion chemical begins in mouth with saliva Stages of Digestion movement propels food through system secretion breakdown of food into molecular sizes food molecules passing absorption through intestinal walls elimination removal of undigested food release of digestive juices digestion © 2006 Plano ISD, Plano, TX Primary Digestive Organs © 2006 Plano ISD, Plano, TX begin the mechanical breakdown of food esophagus - transports food to stomach through the process of stomach - muscular peristalsis organ that stores, mixes, digests and controls passage of food teeth mouth tongue © 2006 Plano ISD, Plano, TX Peristalsis esophagus food stomach © 2006 Plano ISD, Plano, TX series of involuntary muscular contractions in the esophagus that squeeze the food down to the stomach small intestines coiled tube from 3 6m long, the major site for digestion and absorption of nutrients; contain villi large intestines 1.5 m long tube, absorbs water from undigested material anus - opening for removal of feces © 2006 Plano ISD, Plano, TX Accessory Digestive Organs © 2006 Plano ISD, Plano, TX salivary glands secrete a chemical (enzyme) that breaks down into bile, produces liver -starch glucose which helps break down fats in small intestines gall bladder - stores bile © 2006 Plano ISD, Plano, TX pancreas - secretes enzymes that break down starches and proteins Accessory Digestive Organs connected to stomach by ducts liver pancreas gall bladder © 2006 Plano ISD, Plano, TX © 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. 2. 3. 4. © 2006 Plano ISD, Plano, TX 5. 6. 7. 8. 9. 10. 1. mouth 2. esophagus 3. 3. stomach 4. small intestine 5. large intestine © 2006 Plano ISD, Plano, TX 6. anus salivary glands 1. liver 2. 3. bladder gall pancreas 4. © 2006 Plano ISD, Plano, TX 1. 2. 3. 4. 5. © 2006 Plano ISD, Plano, TX 6. 1. 2. 3. 4. © 2006 Plano ISD, Plano, TX Match the structure with the number. © 2006 Plano ISD, Plano, TX salivary small large gall esophagus pancreas stomach liver anus bladder intestine intestine glands Match the function with the number. contains major enzymes organ forfor secretes transports stores mixes the 4 undigestible and accessory enzymes food stores by for digestion stores bile theproduces first andchemical absorption contains villi bile starch digestive peristalsis food breakdown organs of nutrients of food breakdown © 2006 Plano ISD, Plano, TX