Biology Unit 3.3 gcse
- 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
- then reabsorbes all the sugar, plus any mineral ions and water needed.
- produces urine by filtering the blood
- 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 a dialysis machine concentration of dissolved substances in the blood is restored to normal levels
- 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
- to prevent rejection
- people with kidney faliour can use a dialysis machene or have a transplant
- 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.
- b33.2 the human kidney
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