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2015-06-17T18:14:30+08:00

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While the heart pumps, it lets the lungs to deliver oxygen and excrete carbon dioxide to the body. and also as the lungs deliver oxygen, circulation of blood occur. 
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2015-06-17T18:52:03+08:00
The heart pumps the blood that transports the inhaled oxygen to every cell of the body.Carbon dioxide is given off in the process and is carried by the blood to the lungs and is released through exhalation.
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