Question

what is dialysis?how is it helpful??

Answer 1

dialysis is a technique used to purify blood in absence or in failure condition of the kidneys such that the purified nitrogenous waste free blood from the dialysis machine is again resent into the body for circulation.

Answer 2

dialysis is the process of removing toxins, impure blood, or any other waste secretions of the body from many tube like structures of the body. this is done when a person's kidneys are not able to function properly. in other words it is the purification of the blood.
it is helpful as by removing the toxic wastes it keeps the body free of diseases and cures the patients of impure blood