PATHOLOGY

Detailed explanation-1: -Answer and Explanation: The renal artery carries oxygenated, unfiltered blood to the kidneys. The renal veins carry deoxygenated, filtered blood from the kidneys back to the heart.

Detailed explanation-2: -The kidney transports the deoxygenated blood through the renal vein. Since the renal vein carries deoxygenated blood, Carbon dioxide is present in a lower concentration in the renal artery than in the renal vein.

Detailed explanation-3: -The nitrogenous wastes in the human body is removed by the kidney through ultra filteration. The purified blood is carried away from the kidney through renal vein towards the heart. Hence blood in the renal vein will have minimum nitrogenous wastes. So, the correct answer is ‘Renal vein’.