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During inhalation or exhalation air is pulled towards or away from the lungs, by several cavities, tubes, and openings. The organs of the respiratory system make sure that oxygen enters our bodies and carbon dioxide leaves our bodies. The respiratory tract is the path of air from the nose to the lungs.
Carbon dioxide diffuses from the blood into the air in the alveoli. In order to see this content you need to have both Javascript enabled and Flash installed. Some water vapour is also lost from the surface of the alveoli into the lungs-we can see this condensing when we breathe out on cold days.