Chapter_18_Respiratory%20System

Chapter_18_Respiratory%20System - Respiratory System Upper...

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1 Respiratory System Upper Respiratory Tract: The Nose Nasal cavity lined with respiratory mucosa: – traps incoming foreign particles Olfactory receptors in the mucosa on the superior surface of the nasal cavity Functions of the nasal conchae/turbinate bones? • The palate separates the nasal cavity from the oral cavity: the anterior hard palate is made of ? the posterior soft palate made of ? The Pharynx (Throat) • Muscular passageway from the nasal cavity to the larynx The oropharynx & laryngopharynx are common passageways for ? The Larynx (Voice Box) 8 rigid hyaline cartilages Thyroid cartilage (Adam's apple) is the largest hyaline cartilage
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2 Structures of the Larynx Vocal cords/folds : vibrate with expelled air to give sound Glottis : space between the vocal cords Function of glottis? Structures of the Larynx Epiglottis “Guardian of Airways”: – a lid-like flap of elastic cartilage covered with mucous membrane, attached to the root of the tongue Functions of the epiglottis? Upper Respiratory Tract Disorders • Confined to the nose & throat, but if resistance of the upper respiratory mucosal membrane is , the infection may spread to the lower respiratory tract. Chronic sinusitis polyps (grape-like tumor growths) Deviated septum : prone to occlusion in allergic reactions prevents proper sinus drainage sinusitis Epistaxis? Causes? Lower Respiratory Tract: Trachea • Lined with ciliated mucosa (expel dust) • 16-20 “C” shaped hyaline cartilage rings / main bronchi – enter the lungs at a hilus Carina? The Lungs The Lungs • Occupy most of the thoracic cavity, except the most central area , the --------------- ? Which contains?
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3 Bronchial/Respiratory Tree • The bronchi divide 23 times • The first 16 generations are termed the conducting zone – begins at nose & mouth & extends until the terminal bronchiole Beyond the 16 th generation, the respiratory zone begins • Air flow: primary bronchus secondary bronchus tertiary bronchus bronchioli ( walls of cartilage ) terminal bronchiole ( walls of smooth muscle) respiratory bronchiole ( smallest bronchiole ) Respiratory Zone Respiratory bronchioles alveolar duct alveolar sac alveoli Alveoli • Gas exchange units • Contain dust cells
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This note was uploaded on 07/24/2010 for the course HP 320 taught by Professor Islam during the Spring '08 term at USC.

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Chapter_18_Respiratory%20System - Respiratory System Upper...

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