cartoon human heart, cartoon organs, heart cartoon, 3d

science heart background vector muscle organ drawing illustrated red heartbeat open system superior diagram cutaway right cava pump atrium human art interconnection health valentine abstract blood congratulation sketch feelings pulmonary trunk heart attack cardiology anatomy aorta artery biology body medical cardiac medicine superior vena anatomical right ventricle muscular style veins stroke human internal cardiologist coronary vein blood flow four chambers congenital disease arythmia medical cardiac arrest left cross