Renal Artery Carries Pure Or Impure Blood because it takes blood to the kidney for purification

Renal artery carries impure blood into the kidneys .

This artery sub-divides, and the subdivision is carried on and on, until every portion of the kidneys is supplied with arterial blood. From the branches of the arteries the blood passes into capillaries, which are the minute channels that exist between arteries and veins. But in the kidneys, instead of a single there is a double system of capillaries. These capillaries exist in numerous plexuses or net-works, and before the blood can pass into the renal vein, it must flow through the capillary membranes and thus on through the entire and complicated system of these minute vessels.