Artificial kidney is a device to remove nitrogenous waste products from the blood through dialysis. In case of kidney failure, an artifical kidney can be used. Dialysis is the procedure used in artificial kidney to replace a non-functional or damaged kidney. In the process, blood of the patient is allowed to pass through the long cellulose tubes dipped in a tank containing dialysing solution having same ionic concentration as plasma. The waste substances diffuse out of blood into the tank and the cleansed blood is returned back into the patient through a vein.
What is the unit of kidney ?

Explanation

Functions :
(a) It helps in the ultrafiltration of urine.
(b) It regulates the osmotic pressure/water balance of the blood.