Digestive and Excretory Systems


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Living Systems - lesson 1-2

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Digestive and Excretory Systems

  1. 1. Living Systems Focus Question: How do cells get the food they need? Investigation 1-2
  2. 2. Investigation Review <ul><li>Life happens in cells </li></ul><ul><li>Multicellular organisms are made of many living cells </li></ul><ul><li>Cell need certain resources to survive, including </li></ul><ul><ul><li>Water </li></ul></ul><ul><ul><li>Food </li></ul></ul><ul><ul><li>Gas Exchange </li></ul></ul><ul><ul><li>Waste Removal </li></ul></ul><ul><li>Circulatory system circulates blood, which transports the substances living cells need </li></ul>
  3. 3. <ul><li>The first part of this investigation focused on the circulatory system’s relationship with the respiratory system. </li></ul><ul><li>The result was gas exchange. </li></ul><ul><li>We found out how cells get the oxygen they need and get rid of the waste gas, carbon dioxide. </li></ul><ul><li>In this part of the investigation we will find out how cells get the food they need and how they get rid of wastes that are not gases. </li></ul>
  4. 4. Focus Question: <ul><li>Talk in your groups about how you think cells get the food they need and what kind of food cells use. </li></ul><ul><li>Ideas? </li></ul>
  5. 5. Cookie Challenge <ul><li>Imagine that you are small enough to fit on the cookie before you. </li></ul><ul><li>As you eat the cookie, draw the route you are taking on the human body outline. Then, write what is happening at each stage of the route. </li></ul>
  6. 6. Digestion <ul><li>When you eat a cookie, soup and sandwich, or a burrito, you are providing food for your cells. </li></ul><ul><li>Cells can’t eat bread, lettuce, mustard, and cheese. </li></ul><ul><li>Cells can only use simple substances for food. </li></ul><ul><li>Food you eat has to be changed into food that cells can use. </li></ul><ul><li>Process is called digestion. </li></ul>
  7. 7. <ul><li>Digestion is a long process. </li></ul><ul><li>Like a disassembly line. </li></ul><ul><li>Complex food goes in at one end of the line. </li></ul><ul><li>It is taken apart bit by bit as it moves through the system. </li></ul><ul><li>Read an article about the digestion process to find out how food we eat is turned into food that our cells can use. </li></ul><ul><li>Pg. 91, Disassembly Line </li></ul><ul><li>Answer notebook questions when done </li></ul>
  8. 8. The Disassembly Line Review <ul><li>Why do people eat food? </li></ul><ul><li>What happens to food in the digestive system? </li></ul><ul><li>Describe the path taken by food as it passes through the digestive system. </li></ul><ul><li>Explain what happens to food at each place in the digestive system. </li></ul><ul><li>How does digested food get to cells? </li></ul><ul><li>Why do people need kidneys? </li></ul><ul><li>Describe how kidneys work. </li></ul>
  9. 9. Digestion Video <ul><li>Watch and listen for information that confirms or extends what you know about the digestive system </li></ul><ul><li>Think about how new information relates to the big idea of life support for cells </li></ul><ul><li>Review Video Questions </li></ul>
  10. 10. Experiment Review <ul><li>The students in the video conducted an experiment to find out what happens to food (hard-boiled egg white) in different environments. </li></ul><ul><li>Talk in your groups about the experiment: </li></ul><ul><ul><li>What was the question? </li></ul></ul><ul><ul><li>What was controlled? </li></ul></ul><ul><ul><li>What was changed? </li></ul></ul><ul><ul><li>What were the results? </li></ul></ul><ul><ul><li>What was the conclusion? </li></ul></ul>
  11. 11. System Interaction <ul><li>How do the digestive and excretory systems interact? </li></ul><ul><li>Digestive system breaks the food into molecules that the blood transports to all the cells in the body. </li></ul><ul><li>Cells produce waste, which enters the blood. </li></ul><ul><li>Waste travels to the kidneys, which filter it out. </li></ul><ul><li>Two systems interact where the cell exchanges food and waste with the blood </li></ul>
  12. 12. <ul><li>Digestive system - </li></ul><ul><ul><li>Disassembles food into nutrients that cells can use </li></ul></ul><ul><li>Mouth and Teeth - </li></ul><ul><ul><li>Moisten and crush food before it moves through the esophagus to the stomach </li></ul></ul><ul><li>Esophagus - </li></ul><ul><ul><li>Tube connecting the mouth and stomach </li></ul></ul><ul><ul><li>Pushes food through by peristalsis - squeezing </li></ul></ul><ul><li>Digestive juices - </li></ul><ul><ul><li>Juices added to food in the stomach, small intestine, and large intestine to help release nutrients into the bloodstream. </li></ul></ul>
  13. 13. <ul><li>Stomach - </li></ul><ul><ul><li>The organ where food is reduced to mush by acid and muscle activity (squeezing). </li></ul></ul><ul><li>Small Intestine - </li></ul><ul><ul><li>Where digestion really happens. Nutrients from digested food are absorbed into the bloodstream. </li></ul></ul><ul><li>Large Intestine - </li></ul><ul><ul><li>Water is removed from undigested food, leaving solid waste. </li></ul></ul>
  14. 14. <ul><li>Colon - </li></ul><ul><ul><li>End of the large intestine where food waste is compacted and dehydrated </li></ul></ul><ul><li>Kidney - </li></ul><ul><ul><li>Filters cellular waste from the blood and turns it into urine </li></ul></ul><ul><li>Urine - </li></ul><ul><ul><li>Liquid waste produced by kidneys </li></ul></ul><ul><li>Bladder - </li></ul><ul><ul><li>Organ that stores urine until it is eliminated </li></ul></ul>
  15. 15. <ul><li>How do cells in humans get the nutrients they need? </li></ul><ul><li>The digestion system reduces food to nutrients. Nutrients pass out of the digestive system into the bloodstream for transport to all the cells. </li></ul><ul><li>How does the digestive system work? </li></ul><ul><li>Physical and chemical processes break complex food into simple substances as it progresses from the mouth through the esophagus to the stomach, small intestine, large intestine, and colon. </li></ul>
  16. 16. <ul><li>How are cellular wastes removed from the blood? </li></ul><ul><li>Blood filters through the kidneys, which remove cellular wastes, convert them into urine and store them in the bladder. </li></ul><ul><li>Your questions? </li></ul>