Learn about: arteries, arterioles, capillaries, venules, veins, atria, ventricles, superior and inferior vena cava, pulmonary artery and vein, aorta, tricuspid and mitral valve, sinoatrial node, atrioventricular node, and purkinje fibers. Understand each of these terms and where they are located in this color-packed guide to the heart! For all ages to enjoy.