heart receives de- oxygenated blood from all over the body in the rightatrium which is the upper right chamber.
Valves get opened and the blood flows towards the rightventriclewhich is the lower right chamber. The remaining blood in right atrium is pushed down because of the pumping i.e. contraction and relaxation of heart.
Then, rightventriclecontracts pushing the blood into thepulmonary arterythat carries blood to the lungs where CO2 present is exhaled out.
Then, the pulmonary veincarries oxygenated blood from lungs to the leftatrium which is the top left chamber of heart.
there, due to contraction and relaxation of the walls, the blood gets into the leftventricle which is the bottom left chamber of the heart.
Again due to pumping, blood is pushed into the aortathat carries blood to all the parts of the body.
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