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Respiration is a vital physiological process by which the body exchanges gases—oxygen and carbon dioxide—with the environment to support cellular metabolism. In the context of applied physiology, understanding the organs involved in respiration provides insight into how oxygen is taken in, transported, and utilized by the body, and how carbon dioxide is expelled. The respiratory system is composed of several organs working in coordination to ensure effective pulmonary ventilation, external and internal respiration, and cellular respiration. The primary organs involved in respiration include the nasal cavity, pharynx, larynx, trachea, bronchi, lungs, and diaphragm, along with supporting muscles and structures such as intercostal muscles, pleura, and capillary networks surrounding the alveoli. Each organ plays a specific role in ensuring the efficiency and functionality of the respiratory process. The nasal cavity is the entry point for air during inhalation. It warms, humidifies, and filters incoming air using ciliated mucosa and nasal conchae. Particulate matter and pathogens are trapped in the mucus, preventing them from entering deeper parts of the respiratory tract. The nasal cavity also houses olfactory receptors important for the sense of smell. Next, air moves into the pharynx, a muscular funnel that serves as a common passageway for both air and food. It is divided into three parts: the nasopharynx, oropharynx, and laryngopharynx. The pharynx directs air toward the larynx and prevents ingested food from entering the airways through the coordinated action of the epiglottis during swallowing. The larynx, or voice box, is situated below the pharynx and above the trachea. It plays a crucial role in protecting the lower __________ ______ _____ ______ __________ ________ ______ _____.
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