2. Nutrients… Are substances in food that provide energy and materials for cell development, growth, and repair. Group 1

3. Classes of Nutrients CarbohydratesProteins Fats Vitamins Vitamins. ORGANIC (Contain carbon) Group 1

4. Classes of Nutrients Carbohydrates Carbohydrates: main source of energy Proteins Proteins: used for growth. Made of amino acids. Fats Fats: provide energy (stored) and help body absorb vitamins Vitamins Vitamins: organic nutrients that help your body to use other nutrients. Group 1

5. Classes of Nutrients Minerals Water Digestion and Nutrients Inorganic (no carbon) Group 2

6. Classes of Nutrients Minerals Minerals: Inorganic nutrients that regulate many chemical reactions in your body. Water Water: Most vital factor for survival, other than oxygen. Water enables chemical reactions to take place in your cells. Group 2

7. Enzymes  Enzymes are molecules that speed up the rate of chemical reactions  They do this without being changed or used up.  Enzymes also speed up reactions by reducing amount of energy necessary for a chemical change to begin. Group 3

8. Digestive Enzymes are:  AMYLASE is a starch-degrading enzyme secreted in the mouth. This enzyme breaks down carbohydrates.  PEPSIN, found in the stomach, causes complex proteins to break down into less complex proteins.  Enzymes are also responsible for MANY chemical reactions in your body---not just the ones involved in digestion! Group 4

10. Your Digestive System Mouth: Begins chemical & mechanical digestion, glands in mouth produce saliva, which contains amylase, which breaks down starch MOUT H Group 5

11. Your Digestive System Esophagus: muscular tube that connects throat to stomach. Moves food down by squeezing (peristalsis) ESOPHAGU S Group 5

12. Your Digestive System Stomach: muscular bag where chemical and mechanical digestion continue; food stays here ~4 hours, changes to chyme STOMACH Group 5

13. Your Digestive System Small Intestine: tube nearly 7 meters long where digestive juices from liver and pancreas are added; villi absorb molecules from chyme Small Intestine Group 6

14. Your Digestive System Pancreas: a small organ that produces substances that stop the action of stomach acid, makes enzymes that break down carbohydrates PANCREAS Group 6

15. Your Digestive System Large Intestine: absorbs water from undigested food, where unabsorbed materials become more solid LARGE INTESTINE Group 6

16. Your Digestive System Liver: produces bile, which is stored in gall bladder. Bile breaks up large particles of fats into smaller particles. LIVER Group 7

17. Your Digestive System Gall Bladder: small sac that stores bile produced by liver GALL BLADDER Group 7

18. Your Digestive System Rectum: where muscles control the release of wastes from the body RECTUM Group 7

19. Brian Pop - Disgestive System Brain Pop