1.

How does haemodialysis help in purifying the blood?

Answer»
  •  In kidney failure patients’ urea can be removed by a process called hemodialysis. 
  •  Blood drained from a convenient artery is pumped into a dialyzing unit after adding heparin. 
  •  The unit contains coiled cellophane tubes surrounded by dialyzing fluid having the same composition as that of plasma except nitrogenous wastes. 
  •  The porous cellophane membrane of the tube allows the passage of the molecules based on the concentration gradient. 
  •  As nitrogenous wastes are absent in dialyzing fluid, these substances freely move out there by clearing the blood. 
  •  The purified blood is pumped back through a vein after adding anti-heparin to it.


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