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        | part of respiratory system that consists only of the passages that serve airflow |  
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        1. ventilation of lungs 2. exchange of gases between air and blood and between blood and tissue fluid 3. use of oxygen in cellular metabolism |  
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        | consists of alveoli and other gas-exchange regions |  
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        | airway from nose to larynx (head and neck) |  
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        | airway from trachea to lungs |  
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        - cleanses inhaled air - detects odor -resonating chamber that amplifies voice |  
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        | block inhalation of large particles |  
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        | divides nasal cavity into right and left chambers called nasal fossae |  
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        | separates nasal cavity from oral cavity and allows you to breathe with food in your mouth |  
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        | secretes layer of mucus that traps inhaled particles |  
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        | muscular funnel extending from choanae to larynx |  
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        posterior to choanae and dorsal to soft palate - receives auditory tubes from middle ear and houses pharyngeal tonsil -only passes air |  
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        Term 
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        Definition 
        
        between soft palate and roof of tongue - contains palatine and lingual tonsils - -passes air, food and drink |  
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        | opening of oral cavity into the pharynx |  
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        begins with union of nasopharyns and oropharynx - esophagus begins here -passes air, food and drink |  
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        Term 
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        Definition 
        
        voicebox; cartilage chamber that keeps food and drink out of airway and also produces sound
  -during swallowing, muscles move larynx upward while tongue moves epiglottis downward to meet it so epiglottis directs food into esophageal dorsal to airway |  
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        Term 
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        Definition 
        
        | opening of larynx and is guarded by flap of tissue called epiglottis |  
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        -located relatively high and allows them to breathe while swallowing -by age 2, muscle of tongue pushes it lower |  
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        most superior muscle in larynx,  supportive plate in epiglottis |  
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        | largest muscle in larynx, top part is "adam's apple" or laryngeal prominence. testosterone stimulates growth of prominence |  
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        | muscle in larynx that connects larynx to trachea |  
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        pair of muscles in larynx, posterior to thyroid - function in speech |  
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        pair of muscles in larynx that attach to arytenoid  - function in speech |  
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        | pair of muscles in larynx |  
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        Term 
        
        | Intrinsic muscles of larynx |  
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        Definition 
        
        operate vocal cords by pulling on corniculate and arytenoid cartilages - sounds formed into words by pharynx, oral cavity,tongue and lips |  
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        Term 
        
        | extrinsic muscles of larynx |  
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        Definition 
        
        | connect larynx to hyoid bone and elevates larynx during swallowing |  
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        Term 
        
        | vestibular folds of larynx |  
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        | closes glottis during swallowing |  
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        | vocal cords (vocal folds) of larynx |  
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        | produce sound when air passes between them |  
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        -"windpipe" anterior to esophagus -supported by C rings of hyaline cartilage that keeps it from collapsing when you inhale - at inferior end, branches into right and left primary bronchi which supply the lungs |  
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        | smooth muscle in gap of C rings that contracts to adjust tracheal airflow |  
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