human heart

aorta aortic artery atrial atrioventricular atrium auricle blood brachiocephalic cardiac carotid cava cavity chordae circulatory diastolic dupp ecg ekg endocardium epicardium fibers heart human interventricular lubb muscle muscular myocardium organ pericardium phase physiology pressure pulmonary purkinje relaxation sac semilunar septum systole tendineae tissue tricuspid valve vein vena ventricle ventricular vessels visceral