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The respiratory system is a series of organs responsible for taking in oxygen and expelling carbondioxide. This is accomplished by breathing. The respiratory system is not only concerned with the act of breathing, ventilation and oxygen utilization. It is also involved in other functions otherwise termed "The non-respiratory functions of the respiratory system. The organs of the respiratory system are: The nose, pharynx, larynx , trachea, two bronchi(one bronchus to each lung).