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  • Organisation
    • Cell Organisation
      • Similar cells are organised into tissues
        • A tissue is a group of similar cells that work together to carry out a particular function
        • Tissues are organised into organs
          • An organ is a group of different tissues that work together to perform a certain function
        • Organs are organised into organ systems
          • An organ system is a group of organs working together to perform a particular function
            • Organ systems work together to make entire organisms
    • Enzymes and Digestion
      • Digestive enzymes break down big molecules (starch, proteins and fats)
        • Big molecules are to big to pass through the walls of the digestive system so digestive enzymes break them down
          • Bile neutralises the stomach acid and emulsifies fats
      • Carbohydrases convert carbohydrates into simple sugars
        • Amylase is an example of a carbohydrase, it breaks down starch
          • Amylase is made in the salivary glands, the pancreas and the small intestine
      • Proteases convert proteins into amino acids
        • Proteases are made in the stomach, the pancreas and the small intestine
      • Lipases convert lipids into glycerol and fatty acids
        • Lipases are made in the pancreas and the small intestine
    • Food Tests
      • Use the benedicts test to test for sugars
      • Use iodine solution to test for starch
      • Use the biuret test to test for proteins
      • Use the sudan III test to test lipids
    • Circulatory System - The Heart
      • The circulatory system is made up of the heart, blood vessels and blood
        • Humans have a double circulatory system - two circuits joined together
          • In the second one, the left ventricle pumps oxygenated blood around all the other organs of the body. The blood gives up oxygen at the body cells
          • In the first one, the right ventricle pumps deoxygenated blood to the lungs to take in oxygen, the blood then returns to the heart


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