Sometimes, open heart surgery is necessary for the patient's survival . Watch a video of heart bypass surgery . Technology has created the artificial heart . Meet Doctor Joel Posner and learn about heart doctors . Learn about the blood vessels that wind throughout your body .
Arteries carry oxygen-rich blood away from the heart .
Capillaries connect arteries to veins . Veins carry waste products for removal . The pulmonary system allows the exchange of oxygen and carbon dioxide . The circulatory system carries blood throughout the body . The coronary system moves blood through the heart .