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background drawing white pulse circulation diagram structure cardiovascular right pulmonary cross care healthy person element logo icon education health muscle organ science heart red blood art human vector isolated vein feelings sketch retro ink ticker grunge graphic atrium cardiology anatomy aorta artery biology body medical cardiac medicine superior vena cava anatomical right ventricle muscular style pulmonary veins stroke human internal cardiologist coronary vein heartbeat blood flow four chambers congenital heart disease arythmia medical cardiac arrest left cross