heart structure anatomy. heart cross section.

anatomical anatomy and aorta aortic arrest artery articular atrial attack background biology blood body cardiac cardio cardiologist cardiology cardiovascular care chamber chambers chart circulation coronary cross cutaway disease ecg flow graph health healthcare healthy heart heartbeat human icon illustration internal isolated left medical medicine muscle myocardium object organ pulmonary pulse pumping right scheme schooling science scientific section skeletal skeleton spongy structure study superior surgery system thigh tissue trabecular treatment trunk valve vein vena ventricle vessel view white xray