The unoxygenated (unpurified) blood comes into right atrium of heart by superior and inferior vena-cava which then pass to right ventricle.......then to lungs by pulmonary artery.
In lungs this blood get oxygenated (purified).....which then go into left chamber of heart from which blood is passed to aorta and after circulated to whole body
Filtered and cleaned by the liver.
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