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2014-06-14T15:49:13+08:00
Oxygen first then carbon dioxide follows

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2014-06-17T22:27:11+08:00

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When we inhale the oxygen enters our respiratory system and the circulatory system transport it to different parts of our body (and every cells),when the oxygenated blood is transported it becomes deoxygenated (carries carbon dioxide) and it returns to the heart and lungs and we exhale it.
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