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Describe the sequences of oxygen ,carbondioxide and blood flow?

The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other.


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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the sequence of oxygen,carbon dioxide,and the blood flow- the oxygen enters the respiratory system through inhalation and then its enters the blood stream to be circulated in the body.. carbon dioxide from the tissue enter the blood,then to the lungs where is it exhaled
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