Renal Artery: The blood of renal artery contains oxygenated blood with large molecules, more toxins, more salt/Ions, more H2O, less CO2 and more nutrients with compare to blood of renal vein.
Renal Vein: The blood of renal vein contains filtered blood which is deoxygenated blood with less toxins, less salt/ions, less H2O, more CO2, less nutrients, less O2 and urea with compare to blood of renal artery.