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Respiratory System

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Term
Definition
alveolus   air sac in the lungs  
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bronchi   the two main branches leading form the trachea to the lungs that serve as passageways for air  
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bronchioles   one of the smaller subdivisions of the bronchial tubes  
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epiglottis   the uppermost cartilage of the larynx; closes during swallowing to direct food and liquids into the esophagus  
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glottis   the opening between the vocal cords  
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intrapleural pressure   the pressure between the visceral and parietal pleurae, which assists with lung expansion  
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larynx   structure made of cartilage and muscle at the upper end ot the trachea; part of the airway and the vocal apparatus  
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palate   bony structure separating the mouth from the nasal cavity  
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partial pressure   the contribution of a single gas in a mixture of gases toward the total pressure of the gas mixture  
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pharynx   muscular tube behind the oral and nasal cavities; commonly called the throat  
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pleura   serous membrane covering the lungs and the thoracic cavity  
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surfactant   lipoportein secreted by alveolar cells that decreases surface tension of the fluid lining the alveoli, permitting expansion of alveoli  
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tidal volume   the amount of air inhaled and exhaled during quiet breathing  
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trachea   portion of the respiratory tract that carries air through the neck and upper chest  
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ventilation   the movement of air into and out of the lungs  
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vital capacity   the amount of air that can be inhaled and exhaled with the deepest possible breath  
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