 Changes food into substances that cells can use  Eliminates wastes  The digestive tract is 30’ from start to finish.

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Presentation transcript:

 Changes food into substances that cells can use  Eliminates wastes  The digestive tract is 30’ from start to finish

1. Teeth Chew and Breakdown food 3. Tongue Sense of taste Moves food back 2. Salivary Glands Produce saliva Convert starch to sugar 4. Esophagus Moves food to stomach Peristaltic Waves: muscle action that pushes the food down. 7.Liver Produces Bile to breakup and absorb fats 5.Stomach Adds gastric juices (pepsin + hydrochloric acid) Gall Bladder breakup/absorb fats

8. Pancreas Secretions digest fats, proteins and carbohydrates 6. Small Intestine Completes digestion of food 20’ long Villi-”fingers lining intestinal walls, absorb nutrients into the body 9. Colon Large intestine Removes water from wastes (10% of food eaten) 10. Rectum Controls elimination of solid wastes

ADDITIONAL FACTS  It takes 48 hours for a meal to complete a trip through the digestive tract  Chyme: partially broken down food-as it leaves the stomach for the small intestine  The average meal stays in the stomach 4 hours fats/proteins-spend longest time there carbohydrates/liquids-spend least time there  The lining of the stomach protects the stomach from gastric juices