Multiple choice Oxygenated blood reaches heart by ________. pulmonary artery pulmonary vein aorta vena cava Reveal answer Fill a bubble to check yourself B Correct answer Explanation The pulmonary artery carries de-oxygenated blood to the lungs, where it is supplied with fresh oxygen, and carbon-dioxide is removed. The blood, which is now rich in oxygen, returns to the heart through the pulmonary veins.