digestion

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  • Created by: rubyboast
  • Created on: 18-04-18 19:28
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  • Digestion
    • enzymes in digestion
      • produced by specialised cells in glands and in the lining of the gut
        • 1. enzymes pass out of the cells into the digestive system
        • 2. come into contact with food molecules
        • 3. they catalyse the breakdown of large insoluble food molecules into smaller soluble food molecules
      • amylase
        • produced in the salivary glands and the pancreas
        • is a carbohydrase that breaks down starch into sugar
      • protease
        • produced in the stomach, pancreas and small intestine
        • breaks down proteins into amino acids
      • lipase
        • produced in the pancreas and small intestine
        • breaks down lipids into fatty acids and glycerol
    • Enzymes
      • enzymes= biological catalysts
        • speed up chemical reactions in living organisms
      • properties
        • all large proteins
        • a space within the protein molecule called the active site
        • each enzyme catalyses a specific reaction
      • lock and key
        • chemical that reacts with the substrate
          • it fits into the enzymes active site
      • denaturing= high temps and extremes of pH make enzymes change shape
        • cannot work once denatured - substrate cant fit into active site

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