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Functionally, the respiratory system is separated into a conducting zone and respiratory zone. The conducting zone consists of the nose, pharynx, larynx, trachea, bronchi, and bronchioles.These structures form a continuous passageway for air to move in and out of the lungs. The respiratory zone is found deep inside the lungs and is made up of the respiratory bronchioles, alveolar ducts, and alveoli.These thin-walled structures allow inhaled oxygen (O2) to diffuse into the lung capillaries in exchange for carbon dioxide (CO2).he lower tract structures are found in the thorax or chest and include the trachea, bronchi, and lungs (= bronchioles, alveolar ducts, and alveoli). * Please note that many authorities include the larynx with the lower respiratory tract structures.
Upper respiratory tract: This includes the nose, mouth, and the beginning of the trachea (the section that takes air in and lets it out). Lower respiratory tract: This includes the trachea, the bronchi, broncheoli and the lungs (the act of breathing takes place in this part of the system).The organs of the lower respiratory tract are located in the chest cavity.t the same time, carbon dioxide (CO2) is transmitted from the blood capillaries into the alveoli and then expelled through the bronchi and the upper respiratory tract. The inner surface of the lungs where the exchange of gases takes place is very large, due to the structure of the air sacs of the alveoli.