Anathomy, Blood Vessels

In anatomical term, where is the heart located? Name the three of the that make up the wall of the heart. What is the function of each layer? Name the four chamber of the heart and the valves associated with them. List the principal structures of the heart´s conduction system. What are the three deflection waves seen in a typical ECG? What event does each ECG wave represent? Name the three major types of blood vessels.