Biology  Unit 3.3 gcse

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  • Created by: Katie789
  • Created on: 01-05-13 20:36
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  • B33
    • b33.2  the human kidney
      • the kidneys are important for excretion and homeostasis
      • a healthy kidney
        • produces urine by filtering the blood
          • then reabsorbes all the sugar, plus any mineral ions and water needed.
            • excess mineral ions and water are  removed in the urine
    • b33.3 and 4 dialysis -an artificial kidney and kidney transplants
      • people with kidney faliour can use a dialysis machene or have a transplant
        • in  a dialysis machine concentration of dissolved substances in the blood is restored to normal levels
          • levels of useful substances are maintained whilst urea and excess mineral ions pass out from the blood into the dialysis fluid
      • in kidney transplants diseased kidneys are replaced by healthy ones from a donor
        • to prevent rejection
          • kidneys closely matched as possible
          • immunosuppres-sant drugs are used throughout the patients life
    • b33.5 controlling body temp
      • your body temp is controlled by the thermoregulat-ory center in your brain
      • body temp must be kept at a level where the enzymes work best
      • your body responds to cool you down or worm you up if your core body temp changes
        • blood vessels dilate and constrict to control the blood flow
        • you sweat to cool you down
        • shivering causes respiration which warms you up
    • b33.6 treatment and temp issues
      • a kidney transplant allows someone to live a normal life apart from taking drugs. in the long term it costs less than dialasys
      • controll of body temp in different conditions requires several different process which can not always cope with extreme contitions.
    • b3 3.7
      • your blood glucose concentration is monitored and controlled by your pancreas
      • the pancreas produce insulin which tells the liver to convert glucose to glycogen for storage
      • in type  1 diabetes the blood glocoe may rise to fatally high levels because the pancreas does not secrete enough insulin
      • glugagon allows the liver to convert glycogen back into glucose for respiration
    • b3 3.8 treating diabetes
      • a variety of different methods are being used or developed to treat diabetes using genetic engineering   and stem cell techniques.
      • type 2 diabetes is treated by careful attention to diet and taking more exersize. if this doesnt work drugs may be needed.




I really find this mind map useful. It's a good and efficient method for me to memorise my work for my exam.

Thank you do u have any other mind maps for the other three topics in biology unit 3.

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