Concept map on the CIRCULATORY SYSTEM. The circulatory system is composed of blood, blood vessels and the heart. The map illustrates the structure and functioning of the circulatory system. It shows how the heart, blood, and blood vessels work together to transport vital substances. Arteries carry blood from the heart to the periphery of the body, while veins bring it back. Capillaries allow the exchange of nutrients and waste between blood and tissues.