The heart is a pump made from specialized muscles which form four chambers. These muscles are unique and designed to contract and relax at regular intervals to allow blood to come to the heart chambers and pump into the body parts. The chambers of the heart are divided by a muscle partition into left sided chambers and right sided chambers. The left side chamber pumps into the whole body which naturally requires it to be more muscular compared to the right sided chambers which mainly pump only into lungs. Each of these left and right sided chambers are further subdivided into upper(atrium) and lower(ventricle) chambers by way of one-way heart valves which allow blood to flow only in forward directions. The inlet valve on the right side is known as tricuspid valve and the left side is known as mitral valve. Each of the muscular chambers are connected to an outlet pipe which on the left side is known as aorta and on the right side is called the pulmonary artery. Both these pipes are outlet pipes and there are outlet valves in each of them. The outlet valve in aorta is known as aortic valve and the outlet valve in pulmonary artery is known as pulmonary valve.