Digestive System Power Point


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Digestive System Power Point

  1. 1. Digestive System Life Science
  2. 3. Digestive System Vocabulary <ul><li>Digestion the process of breaking food down to be used by the body. </li></ul><ul><li>Calorie a measurement to show how much energy a food contains. </li></ul><ul><li>Nutrients the useable portions of food used for growth, repair, and replacement. </li></ul><ul><li>Esophagus the tube leading from the throat to the stomach. </li></ul><ul><li>Saliva liquid released in the mouth to moisten food and to begin the dissolving of food. </li></ul><ul><li>Liver organ located near the stomach; makes bile which helps break fat into smaller pieces called fat droplets. </li></ul>
  3. 4. Continue Vocabulary <ul><li>Pancreas makes pancreatic juice which contains many enzymes that act on the food in the small intestine. </li></ul><ul><li>Enzymes substances which chemically act on food to break it down. </li></ul><ul><li>Peristalsis muscular contractions that move food through the digestive system. </li></ul><ul><li>the structures that line the walls of the small intestine and are responsible for transferring food into the circulatory system is the Villi. </li></ul><ul><li>In the Villi are tiny tubes that carry blood called VESSELS . Food molecules are taken into these blood vessels. Once the food is in the blood, it can travel all over the body. </li></ul>
  4. 5. The Body needs these Substances <ul><li>Protein (meats, eggs, cheese) </li></ul><ul><li>Vitamins (fruits) </li></ul><ul><li>Carbohydrates (potatoes, bread, pasta) </li></ul><ul><li>Minerals </li></ul><ul><li>Fats (animal fats, oils) </li></ul><ul><li>Fiber (Wheat bread, cereals, fruits/vegetables) </li></ul><ul><li>Water (12 eight ounce glasses per day) </li></ul>
  5. 6. Digestion <ul><li>1. Starts in the mouth </li></ul><ul><li>The mouth and teeth are the </li></ul><ul><li>first step in breaking food down. </li></ul><ul><li>Saliva helps to soften the food. </li></ul><ul><li>It contains an enzyme that helps </li></ul><ul><li>break down the starch in the food . </li></ul><ul><li>2 . Then goes through the Esophagus </li></ul><ul><li>The esophagus is about ten inches long. The tongue helps push the food to the back of the mouth, and the muscles in the esophagus move the food down the tube. </li></ul><ul><li>3 . Then travels to the stomach ( is a muscle) </li></ul><ul><li>In the stomach, food is mixed with acids . The muscles in the stomach move, which helps break down the food. </li></ul>
  6. 8. Continue Digestion <ul><li>4. Then into the Small Intestine </li></ul><ul><ul><li>It’s 23 feet long, </li></ul></ul><ul><ul><li>Digestive juices released in the small intestine finish breaking down the food </li></ul></ul><ul><ul><li>Nutrients are absorbed into the blood vessels </li></ul></ul><ul><ul><li>Walls are filled with millions of Villi </li></ul></ul><ul><ul><li>Villi absorb nutrients and the chemicals that we need from the food into the body. </li></ul></ul><ul><li>5. Then into the Large Intestine </li></ul><ul><ul><li>It’s about 5 feet long long </li></ul></ul><ul><ul><li>In the large intestine, feces are formed from water, undigested food and bacteria. </li></ul></ul><ul><ul><li>Water is absorbed back into the body so the waste material becomes more solid as it travels through the colon. </li></ul></ul><ul><li>6. Then waste goes to the colon and out the rectum </li></ul>