Digestion

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  • Created by: Aysh123
  • Created on: 26-05-14 11:23
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  • Digestion
    • All about making large, insoluble molecules of food into smaller, soluble ones
      • Which the body absorbs and uses
      • Protease enzymes digest proteins, carbohydrase enzymes digest carbohydrates and lipase enzymes digest fats
    • The Alimentary Canal
      • The Mouth- where digestion begins- food is chewed and broken down by carbohydrase enzymes. Chewing is known as digesting 'mechanically'
        • The Stomach- here the food mixes with protease enzymes which digest the proteins. Hydrochloric acid is present to kill bacteria and give a low pH for the enzymes to work
      • The Liver- makes bile which emulsifies fats. It's also alkaline to give the right pH  for the enzymes in the small intestine
      • Pancreas makes the three enzymes- carbohydrase, lipase and protease
      • The small intestine- produces more enzymes to digest the carbohydrates, fats and proteins. Food is also absorbed through the gut wall into the blood, which then takes it around the body to wherever it's needed
      • Large intestine- water is absorbed
      • Rectum- food often contains cellulose, which we can't digest, so it's stored as faeces. Here the faeces is egested through the anus

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