Nostrils. During breathing, air enters the nose by passing through the nostrils, or nares.The nose is the only externally visible part of the respiratory system. The organs of the respiratory system include the nose, pharynx, larynx, trachea, bronchi, and their smaller branches, and the lungs, which contain the alveoli. Humidifier. Purify, humidify, and warm incoming air.Passageway. Passageways that allow air to reach the lungs.Gas exchange. The respiratory system organs oversee the gas exchanges that occur between the blood and the external environment.Elimination. Elimination of carbon dioxide.Oxygen supplier. The job of the respiratory system is to keep the body constantly supplied with oxygen.The functions of the respiratory system are: Practice Quiz: Respiratory System Anatomy and Physiology.External Respiration, Gas Transport, and Internal Respiration.We cannot “do without oxygen” for even a little while, as we can without food or water. 45: 227–243.The trillions of cells in the body require an abundant and continuous supply of oxygen to carry out their vital functions. The physiologic basis of pulmonary gas exchange: implications for clinical interpretation of arterial blood gases. Philadelphia: Lippincott Williams & Wilkins. In: Lippincott's Pathophysiology Series: Pulmonary Pathophysiology. “Gas transport to and from peripheral tissues”. In: Fishman's Pulmonary Diseases and Disorders, edited by MA, Grippi (editor-in-chief), JA, Elias, JA, Fishman, RM, Kotloff, AI, Pack, RM, Senior (editors). “Clinical presentations: gas exchange and transport”.
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