19_Respiratory

19_Respiratory - RESPIRATORY SYSTEM Chapter 25 Functions...

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RESPIRATORY SYSTEM Chapter 25
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Functions Works closely with circulatory system If either the circulatory or the respiratory system fails, oxygen starvation begins Pulmonary ventilation (breathing) Gas exchange Gas conditioning Sound production Olfaction Defense
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Nose and Nasal Cavity Provides an airway for respiration Lined with pseudostratified ciliated columnar epithelium Aids with gas conditioning Blood vessels and mucus help moisten and warm entering air Nasal conchae increase turbulence to increase contact with nasal mucosa Mucus and vibrissae (hairs) filter inhaled air Resonating chamber for speech and sound Houses olfactory receptors
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Pharynx Throat Connects nasal cavity and mouth to larynx and esophagus Three regions: Nasopharynx Pseudostratified ciliated columnar Oropharynx Stratified squamous Laryngopharynx Stratified squamous
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Larynx Voice box Provides open airway Routes air and food Epiglottis closes over the larynx to prevent food from entering Elastic cartilage False vocal cords (vestibular folds) Superior, don’t produce sound True vocal cords (vocal folds) Inferior, produce sound
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Trachea C” shaped hyaline cartilage rings – Posterior wall is not rigid, must muscular – Carina Pseudostratified ciliated columnar Mucus producing goblet cells
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This note was uploaded on 04/06/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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19_Respiratory - RESPIRATORY SYSTEM Chapter 25 Functions...

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