Which of the following blood vessel is relatively poor in urea?

Renal vein is the main blood vessel that carries blood from the kidney and ureter to the inferior vena cava. It contains the least amount of urea. The renal artery enters the kidney as afferent arteriole. It carries the urea loaded blood into the glomerulus of the kidney. The blood is filtered by the glomerulus into the Bowman's capsule and runs parallel to the Loop of Henle.