anatomy Ch25h - Human Anatomy McKinley O'Loughlin Chapter...

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Human Anatomy McKinley & O'Loughlin Chapter 25: Respiratory System Organization and Functions of the Respiratory System o Consists of an upper respiratory tract and a lower respiratory tract. o Conducting portion o Respiratory portion Respiratory System Functions o Breathing (pulmonary ventilation) Inhalation Exhalation o Gas exchange o Gas conditioning o Sound production o Olfaction o Defense Upper Respiratory Tract o Composed of the nose and nasal cavity, paranasal sinuses, pharynx (throat), and associated structures. Nose o The nose is the main conducting airway for inhaled air o External nares Nasal Cavity o Nasal cavity Roof
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Floor o Internal nares Nasal Cavity o The nasal septum o The superior, middle and inferior nasal conchae o Functions: Paranasal Sinuses o Four bones of the skull contain paired air spaces called the paranasal sinuses. Pharynx o Commonly called the throat. Pharynx o Walls are lined by a mucosa and contain skeletal muscles that are primarily used for swallowing. o Partitioned into three adjoining regions: nasopharynx oropharynx laryngopharynx Nasopharynx o Superiormost region of the pharynx. o Located directly posterior to the nasal cavity and superior to the soft palate. o Auditory tubes Oropharynx o The middle pharyngeal region.
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