blood flow pattern through the heart, from the superior or inferior vena cava to nright atrium, tricuspid AV valve, right ventricle, pulmonary semi-lunar valve, pumonary arteries x2, lungs, pumonary veins x4, left v, mitral valve, left atrium, aortic semi-lunar valve, aorta, body, and either the superior or inferior vena cava again
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