GCSE Biology Revision

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  • GCSE Biology Revision
    • Diet and Exercise
      • Nutrients
        • A mixture of different types of food in the correct amounts is needed to maintain health. The main food groups are carbohydrates, fats and proteins.
      • Food Groups
        • Carbohydrates
          • Found in potatoes, pasta, bread, bananas, suger and rice
          • Need by our bodies for a source of energy for life processes
        • Fats
          • Found in cheese, butter, margarine and oils
          • Needed by our bosies for a source of energy for life processes. Fats are also needed to make cell membranes and to insulate our bodies
        • Proteins
          • Found in meat, fish, eggs and cheese
          • Needed by our bodies for growth and repair and building cells
      • Imbalanced diets
        • An imbalanced diet causes a person to become malnourished. Too little food may lead to a person being underweight and too much food may lead to a person being over weight.
        • A poor diet may also lead to deficiency diseases. For example, too little vitamin D in the diet can lead to rickets, which affects the proper growth of the skeleton
      • Metabolic rate
        • Respiration is a chemical reaction that allows cells to release energy from food. The metabolic rate is the speed at which such chemical reactions take place in the body and varies because of several factors, including age, gender and inherited factors
      • Other factors affect health too, including inherited factors. For example, the cholesterol level in blood can affect health.
    • Infectious diseases and vaccination
  • A mixture of different types of food in the correct amounts is needed to maintain health. The main food groups are carbohydrates, fats and proteins.

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