The cardiovascular SYSTEM is responsible for transporting oxygen, nutrients, hormones, and cellular waste products throughout the body, the cardiovascular system is powered by the body’s hardest-working organ, which is the heart... The parts of the cardiovascular system are a. Heart, b. Blood Vessels ( Arteries, capillaries, veins), c. Blood( Red blood cells, white blood cells, platelets and plasma)... The function of the heart is to pump blood. The function of the blood vessels Are to transport blood Throughout the body. The function of the blood is to Supply nutrients and the supply of oxygen to tissues