Chemistry Witrh Physics

Gather, process and analyse information from secondary sources to compare the process of renal dialysis with the function of the kidney Renal dialysis is commonly used to treat patients with kidneys that are not functioning properly. In essence, renal dialysis is using as an alternative for the patient’s kidney. The two main types of renal dialysis are hemodialysis and peritoneal dialysis. Depending on the patient, either of the two processes can be used. Hemodialysis involves the patient going to a facility with a dialysis machine. This dialysis machine removes blood from a vein and it passes through a bundle of hollow fibres which are produced from a partially permeable membrane. This dialyser membrane acts as an artificial kidney and is similar to the filtration that takes place in a normal kidney. Diffusion of waste products takes place from the blood to the dialysis solution and ion components move into the blood. The “clean” blood is now returned to the body. Peritoneal dialysis uses the peritoneium inside the body. It is similar to hemodialysis, but the dialysis solution is introduced through a cathether. The diffusion takes place across the membrane and then the used dialysis solution can be thrown away in a disposable collection bag. This bag is replaced approximately every 4 hours.



Renal dialysis (hemodialysis) Use to filter out metabolic wastes and foreign materials Artificial process Regulated by machine and computer feed-back systems Each session is approximately 3-6 hours. Patients must undergo 3 sessions a week until they get a transplant Diffusion and osmosis across the semi-permeable membrane fibers found in the artificial kidney

Type Regulation


Renal dialysis (Peritoneal dialysis) Ÿ Use to filter out metabolic wastes and foreign materials Ÿ Artificial process Ÿ Regulated by the patient Ÿ Filtering of metabolic wastes is continuous, the mixture must be drained after a prescribed length of time Diffusion and osmosis...