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*The bronchi and bronchioles are parts of the ''''Conduction Zone'''' of the respiratory system - allowing the passage of air from the external environment into the lungs where gaseous exchange can take place.  
 
*The bronchi and bronchioles are parts of the ''''Conduction Zone'''' of the respiratory system - allowing the passage of air from the external environment into the lungs where gaseous exchange can take place.  
*Some of the Bronchioles have alveoli scattered along their length, and thus form part of teh 'Respiratory Zone' - a site for gaseous exchange.
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*Some of the Bronchioles have alveoli scattered along their length, and thus form part of the 'Respiratory Zone' - a site for gaseous exchange.
    
==Histology==
 
==Histology==
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