The internal organs which filter the blood are the

a : kidneys

b : lungs

c : ureters

The correct answer is your kidneys because the organs most intimately related to the substances carried by the blood are the kidneys, which filter out nitrogenous wastes and regulate concentration of salts; the spleen, which removes worn red blood cells, or lymphocytes; and the liver, which contributes clotting factors to the blood, helps to control blood sugar

The correct answer to this question would be c