Answers

2015-06-15T19:50:46+08:00
For the Blood To get Oxygen From it.
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2015-06-15T19:57:44+08:00
It needs to go to the lungs for it to be cleaned again...
exchange of gases occur in the lungs...
the used blood which has more carbon dioxide goes in the lungs for it to be cleaned... the carbon dioxide from the blood will be put out by exhaling it... and inhaling oxygen will make the blood clean inside the lungs...
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