heart

anatomy anemia aorta artery atrium attack background blood body cardiac cardiology cardiovascular cava circulatory clipart college coronary depiction diagram education endocardium epicardium fblood flow graphic health healthcare healthy heart heartbeat human illustrationinternal image internal medical medicine model part pathway pathwayofblood patient pericardium physical physiology pulmonary pulse rate real science scientific sternum stress system this tissue vector vein vena ventricle