BIO210Y5 Study Guide - Final Guide: Bronchus, Lung, Breathing

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Conducting portion and respiratory portion of respiratory tract. Conducting: begins at nasal cavity, extends through pharynx, larynx, trachea, bronchi, bronchioles. Series of filtration mechanisms that prevent airway contamination by debris and pathogens. Produces dense mucus that restricts respiratory passageways and accumulates in the lungs. Harmful bacterial infection may also develop, leading to death. Trace the pathway of air through the upper respiratory system. External nares nasal vestibule (guarded by hairs that screen out large particles) nasal cavity superior, middle, inferior meatuses (air bounces off conchal surfaces) Internal nares (the connections between the nasal cavity and nasopharynx) nasopharynx oropharynx laryngopharynyx. The rich vascularisation of the nasal cavity by the expandable veins in the lamina propria. Air is warmed before it leaves nasal cavity. Heat evaporates moisture from the epithelium to humidify incoming air. Identify the paired and unpaired cartilages that compose the larynx. Phonation: production of sound and one component of speech.

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