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biology module 5.2 - excretion - Coggle Diagram

- - - - ornithine cycle :
        
        ornithine combines with ammonia with the addition of carbon dioxide
        
        produce water molecule (removed) and citrulline
        
        ammonia is added and water molecule is removed
        
        converted into arginine
        
        re-conversion to ornithine by the addition of one water molecule and the removal of urea
- - - - in haemodialysis fluid there is :
        
        no urea, this allows urine in the blood to diffuse into the fluid
        
        normal glucose levels, to prevent glucose diffusing out of the blood
      - takes up to 8 hours, several times a week at hospital
        
        diet has to be monitored / restricted
    - - eventually the dialysis fluid reaches equilibrium with the blood when substances have diffused across
      - patient does not need to constantly be at the hospital
        
        occurs 4 times a day
    - - patient has to undergo surgery
        
        have a normal life for 9-10 years
        
        have to constantly take immunosurpressents (vulnerable to illness)