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2014-07-06T20:32:35+08:00

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Oxygen first enters the respiratory system through inhalation and then it enters the blood stream to be circulated throughout the body. Carbon dioxide from the tissues enter the blood then to the lungs where it is exhaled..

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2014-07-07T21:45:55+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Oxygen is the air you inhale... CO2 is air you breath out... the blood flow is the flowing of your blood to all parts of your bod.. 

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