The Cardiovascular System is composed of the heart and the blood vessels. The main function of the cardiovascular system is to pump blood around the body. The cardiovascular System is divided into two parts, the systematic circuit and the pulmonary circuit. The systematic circuit contains oxygenated blood and the pulmonary blood contains deoxygenated blood. In order to prevent oxygenated and deoxygenated blood from mixing there is a structure called an interventricular septum. The septum separates the cardiac chambers; right and left atria and the right and left ventricles. There are four valves, which regulate backflow to the chambers. There are two types of valves, which are the atrioventricular valves and the semilunar valves. The atrioventricular
