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THE DIGESTIVE SYSTEM

THE DIGESTIVE SYSTEM. BIG IDEA The digestive system: provides nutrients energy for your body through the digestion of food . Objective. Students will learn: How the digestive system provides nutrients and energy to the body through the digestion of food. What happens During Digestion?.

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THE DIGESTIVE SYSTEM

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  1. THE DIGESTIVE SYSTEM BIG IDEA The digestive system: provides nutrients energy for your body through the digestion of food

  2. Objective • Students will learn: • How the digestive system provides nutrients and energy to the body through the digestion of food.

  3. What happens During Digestion? • Main Idea: • During digestion, foods are broken down and absorbed as nourishment or eliminated as waste. • Digestion • Mechanical breakdown of foods within the stomach and intestines for use by the body’s cells. • Absorption • Passage of digested food from the digestive tract into the cardiovascular system • Elimination • The body’s expulsion of undigested food or body waste

  4. How Digestion Works • Main Idea: The digestion system consists of the mouth, esophagus, stomach and intestines. • Mouth--teeth ,salivary glands, tongue • Esophagus—muscular tube about 10 inches long that connects the pharynx with the stomach • Stomach—hollow sac organ enclosed in a wall of muscles. These muscles are flexible and allows the stomach to expand when you eat. • Intestines—pancreas, liver and gallbladder, small and large intestines.

  5. Esophagus • Muscular tube • 10 inches long • Connects pharynx with the stomach • Peristalsis—pare-ih-STAWL-suhs—voluntary muscle contractions that moves food through the digestive tract.

  6. The Stomach • Hallow • Sac-like-organ • Flexible muscles • Stomach expands • 3 tasks—1. Mixing foods with gastric juices—2.Storing partially digested food and liquid—3. Moving food into the small intestines • 3 layers in stomach muscles

  7. The Pancreas, Liver and Gallbladder • Pancreas produces enzymes • Liver produces bile • Glands in walls of intestine

  8. The Small and Large Intestine Small Intestine Large Intestine 20-23 feet in length 1 inch in diameter Consist of 3 parts: duodenum—jejunum—ileum Digestives juice secreted from small intestine, liver and pancreas 90% of all nutrients are absorbed by small intestine Villi—finger-like projection—absorb nutrients 5-6-feet long 2.5 feet in diameter Unabsorbed materials move by peristalsis into large intestine Undigested parts of food-fiber-roughage is pass into colon Function is to absorb water, vitamins and salts, and to eliminate waste

  9. Functional and Structural Problems • Functional • Indigestion • Constipation • Heart burn • Gas • Nausea • Diarrhea • Structural • Tooth decay • Gastritis • Peptic ulcer • Gallstones • Lactose intolerance • Appendicitis • Colitis • Colon Cancer • Hemorrhoids • Crohn’s disease • Cirrhosis

  10. The Digestive System

  11. The Stomach

  12. Good versus Bad (Liver)

  13. How the Body Work • http://kidshealth.org/kid/htbw/

  14. Human Digestive System http://health.howstuffworks.com/adam-200142.htm Glencoe Health book pages 422-428 http://kidshealth.org/kid/htbw/

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