And it uses those electrical signals to create the muscular contraction that is needed to move all that blood through the blood vessels of our body. In fact, physicians can actually study and analyze the way that the heart of the patient produces electrical signals. And they can determine different types of abnormalities that might exist within the heart simply by using this tool. So this tool is known as an electrocardiogram. An electrocardiogram is a graph that describes the electrical signal that is generated by the heart. Now, how do we actually obtain the electrocardiogram?