ABSTRACT
In this chapter, the elements and structure of the circulatory system are described. In mammals, the circulatory system is a tubular system, in which blood flows from the heart to the capillaries and back through the veins. The arteries are the conducting channels from the heart and can be divided into elastic (conducting), muscular (distributing), and arterioles. The capillaries are the smallest units of the circulatory system and connect with venules (small veins) and finally veins that reach the heart. The lymph flows through the lymphatic system, draining from the tissues and connected with the major veins.
