Information on the kidneys

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How urine is produced

  • Blood is filtered through a renal capsule
  • Urea, water, ions, glucose and occasionally amino acids go through
  • Proteins and cells don't go through - they are too big
  • Kidneys reabsorb all glucose, some water and some ions
  • Selective re-absorption
  • Glucose reabsorbed by active transport
  • Urea not reabsorbed
  • Urea travels to bladder - forms urine with excess water and ions
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  • Formed in liver
  • From breakdown of amino acids
  • Mixes with water and ions to make urine
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  • No rejection drugs need to be taken
  • Can be done overnight
  • No waiting list
  • No worry of rejection


  • More expensive
  • Not a long term solution
  • Deoendent on machines to stay alive
  • Have to have a fistular fitted
  • Have to be careful with diet
  • Risk of infection
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  • Cheaper
  • Long term solution
  • Lead almost normal life
  • Not dependent on machines


  • Must take anti rejection drugs for rest of life
  • Weakens the immune system
  • Chance of rejection
  • Can still die - life expectancy not as long as normal person
  • Risk of complications in surgery
  • Long waiting list
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