ANATOMY

Detailed explanation-1: -The substances removed from the blood form urine. The cleaned blood then travels to the heart and is pumped to the rest of the body.

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: -After the kidneys have performed their cleansing function, the filtered, deoxygenated blood leaves the kidneys through the renal vein, moves up the inferior vena cava, and returns to the heart.

Detailed explanation-4: -Renal Veins carry filtered blood from the kidneys to the posterior vena cava. Renal Arteries carry unfiltered blood from the aorta to the kidneys.