Click for an easy step-by-step of the heart cycle! Learn the cardiac phases including diastole and systole with this simple diagram that makes cardiology and physiology easy! Great for nursing notes and medical students studying the circulatory system! Also discusses the conduction system, blood flow through the heart, and the anatomy of the heart including the ventricles, atria, valves, superior and inferior vena cava, pulmonary artery, and aorta.