the process goes this way. at first all the deoxygenated blood is collected from upper parts of the body through superior venecava and lower parts of the body through the inferior venecava. then it enters the first right chamber of the heart then passes through tricuspid valve to lower right chamber .then it is carried to the lungs through pulmonary artery . there,it gets mixed with oxygen with the help of haemoglobin in the blood. this oxygenated blood gets carried to the left chamber of the heart through pulmonary vein. then it passes through bicuspid valve to the lower left chamber and finally it is pumped out to different parts of the body.
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