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Kidneys are vital organs for survival. Several factors like infections, injury, very high blood pressure, very high blood sugar or restricted blood flow to kidneys.  This leads to accumulation of poisonous wastes in the body and leads to death. Dialysis machine is used to filter the blood of a person whose kidneys are damaged. The process is called haemodialysis. In this process blood is taken out from the main artery, mixed with an anticoagulant, such as heparin, and then pumped into the apparatus called dialyzer. In this apparatus blood flows through channels or tubes. These tubes are embedded in the dialyzing fluid. The membrane separates the blood flowing inside the tube and dialyzing fluid (dialyses), which has the same composition as that of plasma, except the nitrogenous wastes. As nitrogenous wastes are absent in dialyzing fluids, these substances from the blood move out freely, there by cleaning the blood of its wastes. This process is called dialysis. This is similar to function of the kidney but is different as there is no reabsorption involved .The cleaned blood is pumped back to the body through a vein after adding anti-heparin. Each dialysis session lasts for 3 to 6 hours. This method has been using for thousands of uremic / kidney failure patients all over the world. 
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Dialysis is used to filter the blood of a person when both kidneys are damaged. the process is called Haemodialysis. the principle involved in this is diffusion. in this process, blood is taken out from the main artery, mixed with an anti-coagulant like heparin and then pumped into a channel of tubes called dialyzer. these tubes are embedded in dialyzing fluid. the dialyzing fluid has the same composition as that of plasma except the nitrogenous wastes.as the wastes are absent in the dialyzing fluid, these substances from the patient's blood move out freely thereby cleaning the blood of its wastes. this process is similar to the working of kidney but reabsorption does not take place in dialysis. the blood id sended back into the body. this process is long and can take upto 6 hours.
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