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  • Created by: Uswa
  • Created on: 29-03-13 15:53
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  • Kidney
    • A healthy kidney produces urine by:
      • First filtering the blood
      • Reabsorbing the sugar
      • Reabsorbing the dissolved ions needed by the body
      • Reabsorbing as much water as the body needs
      • Releasing urea, excess ions and water as urine
    • People who suffer from kidney failure may be treated:
      • By having a healthy kidney transplanted
      • Using a kidney dialysis machine
        • Treatment by dialysis restores the concentrations of dissolved substances in the blood to normal levels
    • Dialysis machine
      • A person's blood will flow between partially permeable membranes
        • Dialysis fluid contains same concentration of useful susbtances as the blood
          • This ensures that glucose and useful mineral ions aren't lost
          • Urea passes our from the blood into the dialysis fluid
    • Kidney transplants
      • Diseased kidney replaced with a healthy one from a donor
        • However, the donor kidney may be rejected by the immune system, unless precautions  are taken
          • Antigens are protein on surface of cells. Recipient's  antibodies  may attack the antigens on donor organs, as they don't recognise them as part of recipient's body
            • To prevent rejection of transplanted kidney:
              • Donor kidney with 'tissue-type' similar to that of recipient, is used
              • Recipient is treated with drugs that suppress their immune system


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