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Y7 Life 10 digestive enzymes

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Y7 Life 10 digestive enzymes

  1. 1. Digestive Enzymes <ul><li>Learning Objective : </li></ul><ul><li>Explain the role of enzymes in digestion. </li></ul><ul><li>Starter : </li></ul><ul><li>Name the organs of the digestive system in order. </li></ul>
  2. 2. Can you remember the names of all the parts of the digestive system? Mouth Oesophagus Stomach Small Intestine Large Intestine Rectum
  3. 3. Enzymes <ul><li>Different enzymes are added by the digestive system at various stages. </li></ul><ul><li>There are different enzymes for different functions. </li></ul><ul><li>Let’s look at the different enzymes which breakdown food </li></ul>
  4. 4. How do enzymes work?
  5. 5. Amylase Amyase
  6. 6. Carbohydrates are chains of identical sugar molecules. The digestive enzymes called carbohydrase s break the chemical bonds between the individual sugar molecules in each carbohydrate chain. carbohydrase long carbohydrate molecule sugar molecules Enzymes and carbohydrate digestion
  7. 7. Investigation <ul><li>Tie one end of visking tubing, fill with starch & amylase solution. </li></ul><ul><li>Soak in warm water for 15-20 minutes. </li></ul><ul><li>Test the water for glucose using Benedict’s solution. </li></ul>
  8. 8. Practical Activity <ul><li>Safety First: </li></ul><ul><li>Wear safety goggles </li></ul><ul><li>Stand up </li></ul><ul><li>Tuck your chair & bags under your desk </li></ul><ul><li>Tie back long hair </li></ul>
  9. 9. Protease
  10. 10. Proteins are made up of amino acids . There are 20 different types of amino acids. Proteins are digested by digestive enzymes called proteases . These enzymes work in an acidic environment to break proteins into smaller amino acids. protease long protein molecule amino acid molecules Enzymes and protein digestion
  11. 11. Lipase
  12. 12. <ul><li>Fats are digested in two stages: </li></ul><ul><li>Firstly, bile (released by the gall bladder) allows the fat to “mix” with water by breaking the fat into smaller droplets. This is called emulsification . </li></ul><ul><li>Secondly, the digestive enzyme lipase breaks each fat molecule into the smaller glycerol fatty acid molecules . </li></ul>bile lipase + fat molecule glycerol fatty acids Enzymes and fat digestion
  13. 13. Digestive Enzymes Digestive Enzymes
  14. 14. 8A What’s in food? blue turns orange/red = glucose heat chopped up food hot water Blue Benedict’s solution turns orangey-red when it is boiled with glucose.
  15. 15. Digestive enzymes activity
  16. 16. Digestive Enzymes <ul><li>Learning Objective : </li></ul><ul><li>Explain the role of enzymes in digestion. </li></ul>

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