2. The Digestive System By: Jess Sequeira, Jordan Ortiz- Pallen, Toni Gadar, Emily Brazis, and Mayreni Sweis Everyone

3. What is the digestive system? The system that breaks down food so that it can be used by the body The system that breaks down food so that it can be used by the body One of the nine major organ systems in the body One of the nine major organ systems in the body Includes mouth, esophagus, stomach, small and large intestines, rectum and anus Includes mouth, esophagus, stomach, small and large intestines, rectum and anus Jordan

4. Why is the digestive system important? Changes food into nutrients Changes food into nutrients Absorbs and transports nutrients Absorbs and transports nutrients Removes food wastes from the body Removes food wastes from the body Jordan

5. What you’ll learn about the digestive system. Mechanical vs. chemical digestion Mechanical vs. chemical digestion Organs of the digestive system Organs of the digestive system What happens in each organ What happens in each organ How homeostasis is maintained in the digestive system How homeostasis is maintained in the digestive system Role of bacteria in the digestive system Role of bacteria in the digestive system Emily

6. Picture of the digestive system http://www.carlson-art.com/lifescience/digestive-system-lg.jpg Mayreni

7. Digestive System Failures Loss of teeth Loss of teeth Scleroderma of the esophagus Scleroderma of the esophagus Stomach cancer Stomach cancer Gallstones Gallstones Pancreatic cancer Pancreatic cancer Colon cancer Colon cancer Jess

8. The parts of the digestion system http://www.google.com/images?um=1&hl=en&client=firefox-a&rls=org.mozilla%3Aen- US%3Aofficial&tbs=isch%3A1&sa=1&q=digestive+system&aq=f&aqi=g10&aql=&oq=&gs_rfai= Mayreni

9. Picture of the small intestine http://www.colorado.edu/intphys/Class/IPHY3430- 200/image/21-2d.jpg Mayreni

10. Digestive System Vocabulary Digestion: mechanical and chemical processes that breaks down food into smaller molecules so they can be used in the body’s cells Digestion: mechanical and chemical processes that breaks down food into smaller molecules so they can be used in the body’s cells Enzyme: molecules that speed up the rate of chemical reactions in the body Enzyme: molecules that speed up the rate of chemical reactions in the body Toni

11. Digestive System Vocabulary (Continued) Mechanical digestion: process that occurs when food is chewed in the mouth and churned in the stomach Mechanical digestion: process that occurs when food is chewed in the mouth and churned in the stomach Chemical digestion: process that breaks down food into different smaller molecules so it can be absorbed by the body’s cells; takes place in the mouth, stomach, and small intestine Chemical digestion: process that breaks down food into different smaller molecules so it can be absorbed by the body’s cells; takes place in the mouth, stomach, and small intestine Toni

12. Digestive System Vocabulary (Continued) Saliva: watery enzyme containing fluid in the mouth that is mixed during digestion Saliva: watery enzyme containing fluid in the mouth that is mixed during digestion Peristalsis: wavelike muscular contractions that move food through the digestive system Peristalsis: wavelike muscular contractions that move food through the digestive system Chyme: thin, watery product that is the result of digestion Chyme: thin, watery product that is the result of digestion Villi: fingerlike projections in the small intestine where nutrients are absorbed into the blood stream Villi: fingerlike projections in the small intestine where nutrients are absorbed into the blood stream Toni

13. Test Questions 1. Compare mechanical and chemical digestion. 2. Where does most digestion occur? 3. What product is made by bacteria in the large intestine? Everyone

14. Test Questions (Continued) 4. What continues to force the remaining materials that haven’t been digested or absorbed slowly into the large intestine? 5. Food is processed in your digestive system for the purpose of supplying your body with raw materials for _________. Everyone

15. Test Answers 1. Mechanical digestion is a process that occurs when food is chewed in the mouth and churned in the stomach. Chemical digestion is a process that breaks down food into separate, smaller molecules so they can be absorbed into the body’s cells. Chemical digestion is a process that breaks down food into separate, smaller molecules so they can be absorbed into the body’s cells. 2. Most digestion occurs in the duodenum. Everyone

16. Test Answers (Continued) 3. Essential vitamins are produced in the large intestine. 4. Peristalsis pushes the remaining material into the large intestine. 5. metabolism Everyone

17. Fun facts Digestive juices mix with food. Digestive juices mix with food. Breaking large molecules to small molecules. Breaking large molecules to small molecules. Begins in mouth. Begins in mouth. Ends in small intestine. Ends in small intestine. Enzymes in the digestion system Enzymes in the digestion system Made up of digestive track Made up of digestive track Mayreni

18. Fun facts (Continued) Inside of hollow organs, is a special lining called the mucosa Inside of hollow organs, is a special lining called the mucosa Digestive track also contains a layer of smooth muscle that helps break down food, and helps it to move down tract Digestive track also contains a layer of smooth muscle that helps break down food, and helps it to move down tract Mayreni

19. Thanks for listening to our presentation! Researched by: Emily, Toni, Jordan, Jess, and Mayreni Edited by: Jess Sequeira Jess