Question

why do sometimes artificial Kidneys are needed

Answer 1

It is when our kidneys don't work properly.
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Answer 2

here is your answer.....

Hemodialysis is a method for removing waste products such as creatinine and urea, as well as free water from the blood when the kidneys are in kidneyfailure. The mechanical device used to clean the patients blood is called a dialyser, also known as an artificial kidney.

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