functions of blood- transport

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  • Functions of blood (transport)
    • transport elements required for life around the body
      • many transported from digestive system to tissues or storage areas
        • e.g. liver
    • Those that cannot be dissolved in water e.g fats
      • Carried by blood proteins called lipoproteins
    • two main forms of lipoproteins
      • high density lipoprotein (HDL)
        • prevents or reverses harmful deposits
      • low density lipoprotein (LDP)
        • deposits fat and cholesterol to walls of arteries
      • Transport  fat to tissues for energy
    • transports oxygen and carbon dioxide between tissues and lungs
      • red blood cells contain haemoglobin
        • Haemoglobin: iron-containing protein
    • haemoglobin + oxygen = oxyhaemoglobin
    • erythrocytes have no cell nucleus
      • more space for haemoglobin
      • disc shape
        • helps exchange oxygen
    • transports hormones
      • e.g. adrenaline
      • travel in the blood to target organs where needed

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