The primary function of the cardiovascular system is to get oxygen to all points of the body, through use of blood.  The central organ is the heart.  The heart is made up of cardiac tissue, pumps the blood. First, to the lungs to receive oxygen, and then to  various parts of the body for distribution.  The blood stream will then begin another cycle in which the unoxegynated blood travels back to the lungs.  Blood travels through a system of arteries (oxygenated blood) and veins (unoxygenated blood).  This system is called the circulatory system and can be thought of as the bodies highway.  The cardiovascular is one of the most important systems in the body, as all other organs and tissues rely on it for the oxygen vital to their function.

Structure  Location  Blood Flow  Circulatory