The Digestive System

1. The Digestive System Food, Food, Food!!!!!!

2. Function http://www.youtube.com/watch?v=OYWVbt6t2mw&feature=related • Break down food taken in to the body • Chemical digestion • Mechanical digestion • Absorb food that has been broken down • Absorb water that is taken in to the body • Eliminate indigestible waste

3. Components • http://www.argosymedical.com/Digestive/samples/animations/Sherwood%20Swallowing/index.html • Mouth • Teeth – mechanically break down food • Salivary glands – saliva chemically breaks down food – contains enzyme amylase to break down starch • Tongue – mixes food with saliva and pushes to the pharynx to be swallowed Swallowing – food passes through the pharynx epiglottis closes over trachea food enters esophagus

4. Components • Esophagus • tube that passes food from the pharynx to the stomach • lined with smooth muscle – moves food by waves of contractions called peristalsis • Stomach • Hydrochloric acid – continue chemical digestion • Smooth muscle of stomach contracts and relaxes to continue mechanical digestion • It takes 2 – 4 hours for food to pass through the stomach to the small intestine • Chyme – lump of food that leaves the stomach

5. Components • Liver – secretes bile (an emulsifier) to break apart fats • Gall Bladder – where bile is stored until needed • Pancreas – secretes enzymes to continue the chemical digestion of food

6. Components • Small Intestine • Tube that leads from the stomach to the large intestine • Chemical digestion finishes • Minerals and nutrients are absorbed • It takes 3 – 6 hours for chyme to pass through the small intestine • Large Intestine • Tube that connects the small intestine to the anus • Remaining water is absorbed from the chyme

7. Components • Anus • Opening through which waste is removed from the digestive system • It takes 24 – 72 hours for food to move through the entire digestive system http://www.argosymedical.com/Digestive/samples/animations/Digestion/