The Respiratory System Of The Upper Respiratory Tract Essay

1132 Words Dec 12th, 2016 5 Pages
The Upper Respiratory Tract
The human respiratory system involves complex organization of structural and defense mechanisms for the inhalation and exhalation of gases. The primary function of the respiratory system is to breathe air, provide oxygen to the bloodstream, and expel carbon dioxide. The respiratory system also provides transport of respiratory gases, internal respiration, pulmonary ventilation, and external respiration. There are two zones of the respiratory system, the conducting zone and the respiratory zone. The conducting zone is comprised of structured conduits for air to flow to sites of gas exchange and includes the nose, nasal cavity, pharynx, larynx, trachea, and bronchi. The respiratory zone is a site of gas exchange and includes respiratory bronchioles and alveolar ducts with capillaries (Young, 2001).
Beginning with the external environment, the nasal flares open into the nasal cavities. These are lined with moist epithelium to moisturize cold, dry air from outside.. Within the nasal flares, there are cilia, microscopic hairs that line the all air passages, except the mouth and parts of the nose, and move in a sweeping motion to keep air passages free of foreign particles (Reznik, 1995). The cilia sweep the particles towards the mouth where they can be swallowed, coughed, or sneezed away from the body. Cells in the trachea and bronchial tubes create mucus to create a moist environment and prevent dust, bacteria, and viruses from entering the…

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