The digestive system

• An enzyme is a biological catalyst - a protein that can speed up or control a specific reaction
• Digestive enzymes convert larger food molecules into smaller soluble molecules that can be absorbed into the blood stream .
• Carbohydrate enzymes:

  • carbohydrates -> simple sugars
  • Amylase is produced by the salivary glands , pancreas and small intestine
  • It breaks down starch in the mouth and small intestine
• Protease enzymes:

  • proteins -> amino acids
  • Produced by the stomach , pancreas and small intestine.
  • Break down of proteins occurs in the stomach and small intestine.
• Lipase enzymes:

  • lipids -> fatty acids + glycerol
  • Produced by the pancreas and small intestine
  • Break down of lipids ( fats and oils ) occurs in the small intestine
• Salivary gland produces digestive enzymes
• Liver produces bile
• Some digestive happens in the stomach
• Pancreas produces digestive enzymes
• In the large intestine water is absorbed and faeces is formed
• In the small intestine digestion is completed and soluble substances are absorbed