Circulatory System or Cardiovascular System is an Organ System with a network of vessels and organs that permits blood to flow and circulate to transport necessary body substances to and from the cells. Heart, Blood and The Blood Vessels are the parts of the Circulatory System. Blood Vessels are the hollow tubes formed as intricate networks found throughout the body in which blood circulates or transport blood throughout the entire body. There are three types of blood vessels: arteries (carry oxygenated blood from the heart to all parts of body), veins (carry oxygen-depleted blood towards the heart), and capillaries (connect the arteries to veins).
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