The kidneys filter and purify the blood, throwing out the impurities through the urine.
If the kidneys become diseased and cease functioning, the blood gets poisoned and the patient dies.
The only way to deal with kidney failure is to transplant a healthy kidney obtained from a living or just dead person — or to remove the impurities from the blood artificially.
The technique for removing waste products from the blood is called dialysis.
In dialysis, blood from an artery in the arm (or leg) is drawn into a dialysis machine and the purified blood is fed into a vein.
The person requiring dialysis has to undergo an 8–hour session connected to the dialysis machine every two or three days.
It is an exhausting and costly process.