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The nose. The nose is the only part of the respiratory system that is visible externally and is the route for air entry into the respiratory system. Air is drawn in via the nostrils or external nares and enters the large nasal cavity, which is divided into two by the nasal septum..The nose and nasal cavity form the main external opening for the respiratory system and are the first section of the body s airwaythe respiratory tract through which air moves. The function of the nasal cavity is to warm, moisturize, and filter air entering the body before it reaches the lungs..These include the nose, pharynx, larynx, trachea, bronchi and lungs. The respiratory system does two very important things it brings oxygen into our bo.s, which we need for our cells to live and function properly and it helps us get rid of carbon dioxide, which is a waste product of cellular function..
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