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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.
Air enters our lungs ( oxygen, nitrogen, but also carbon dioxide, water , and numerous solid and liquid particles). But the lungs only absorb oxygen, and partially : the exhaled air is poorer in oxygen (less than 21%). The number of nitrogen molecules entering and exiting your lungs is the same.