Biology Chapter 5 - Part 2

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  • Biology Chapter 5 - Part 2
    • Transport in the blood
      • Blood plasma transports - CO2 to lungs -soluble products of digestion -urea from liver to kidneys
      • Blood is a tissue
      • Plasma contains, red blood cells, white blood cells and platelets
    • Immune system
      • Antigens are proteins on the surface of cells
      • White blood cells respond to foreign antigens by producing antibodies
    • Human blood groups
      • Red blood cells have antigens on their surface (A and B)
      • A + b = A       a + B = B    A + B = AB    a + b = O
        • Giving b.g A   to b.g B person can be fatal
      • Plasma contains antibodies (a and b)
    • Digestive enzymes
      • Amylase
        • Produced in glands, pancreas + small intestine,
        • Breaks down starch into sugars
      • Protease
        • Produced in stomach, small intestine and pancreas
        • Breaks down proteins into amino acids
      • Lipase
        • Produced by pancreas and small intestine
        • Breaks down lipids to fatty acids and glycerol
    • Digestive system 1) Glands (pancreas, salivary) - produce enzymes
      • 2) Stomach and small intestine - where digestion occurs
        • 3) Liver - produces bile which neutralises stomach acids
          • 4) Small intestine - absorbs soluble food
            • 5) Large intestine - absorbs water
          • Fats emulsified to increase surface area so more space for enzyms to break down

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