we know that a vein carry impure blood but when we do not have kidneys a dialysis machine that takes impure blood and gives pure blood to veins

Dear Student

Ahh,you are right...dailyses purify blood...but the veins carry impure blood from all body parts and then goes to heart...work of kidney is just to filter blood and kidney is also responsible for sweating...not to giving blood to veins

Thanks for asking

Regards

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