components of blood

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  • COMPONENTS OF BLOOD
    • RED BLOOD CELLS
      • Transport oxygen
      • Contain haemoglobin
        • A pigment that combines with oxygen to for oxyhaemoglobin
      • Bi-cocave shape to increase surface area
      • Large surface area
        • Oxygen is closer to the surface to diffuse
      • Diameter is the same size as capillaries to increase PRESSURE
    • WHITE BLOOD CELLS
      • Help our immune system
      • Able to squeeze through the walls of the blood vessels
      • Phagocytes ingest invading micro-organisms and lytic enzymes digest them
        • Rendering them harmless
      • Lymphocytes produce specific antibodies
    • PLATLETS
      • The remains of dead cells
      • No nucleus and don't behave like normal cells
      • 1. Help to make tiny fibres that form a net
        • 2. Red blood cells get trapped in the net
          • 3. The clot dries, forming a scab which protects the cut whilst new skin grow
    • PLASMA
      • The blood fluid
      • Mostly made of water
      • Some substances can dissolve in it
      • Carries the 3 other types of blood cells
      • Both useful substances  (digested food) and waste substances (CO  and urea)
        • Dissolve into plasma and are transported around the body
      • 55% of blood

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