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Oxygen is the most important nutrient of all, and the only way we can get it is to absorb it throughthe delicate linings of the lungs. The lungs pick up oxygen from the air we breath and expel carbon dioxide from the blood stream. Without adequate supplies of oxygen to the tissues, health simply cannot be maintained. In our highly industrialized society, our lungs are exposed to much higher levels of pollutants than before. The most dangerous are: heavy metals, oxides of nitrogen and sulfur and carbon tetrachloride. Moreover, many forms of electromagnetic radiation, smoking and harmful microorganisms influence pathological conditions of the respiratory system.