A heart murmur is a continuous sound that is audible with a common stethoscope, produced when blood passes through particular areas of the heart. The heart has four chambers, two atria (singular = atrium) and two ventricles separated by a "skeleton" of cartilage that separates each chamber. This skeleton is made up of the atrial septum, the ventricular septum and four valves (aortic, pulmonary, mitral and tricuspid) that direct blood flow in a specific route within the heart allowing the most efficient use of each heart beat to pump blood to the rest of the body.
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