,ThissystemisresponsibleforbringO2intothebodyandgetridcarbondioxide(
CO2)fromthebody.
•Theairentersthebodyfromnostrilsthenpassthroughnasalcavitytothe
pharynx,larynx,trachea,bronchi,bronchioles,thentothealveoliinthelungs.
•Respiratoryepithelium:Respiratorytractlinedwithciliatedpsuedostratified
columnarepitheliumthatcontainsarichpopul
, UPPRESPIRATORY SYSTEM
Paranasal Sinuses NASAL CAVITY
(Air Filled Cavities)
, The Nasal Cavity
Thenasalcavityisdividedintotwochambersbynasalseptum,
•Thenasalseptumformsthemedialwallofthenasalchamber.
•Theanteriorpartofnasalseptumiscomposedfromcartilage,
andtheposteriorpartcomposedfrombone.
•Thelateralwallofthenasalcavitycontainsthreeprominentel
evationscalledconchae(superiorconcha,middleconcha,a
ndinferiorchoncha).Thereforethreeairmeatusesareform
edforairpassage,theseareinferior,medile,andsuperiorme
atuses
•Theinferiorandmiddleconchaearelinedbyrespiratoryepith
elium.
•Thesuperiorchonchaearecoveredwithspecializedolfactory
epithelium(forsmell=olfection).
•Olfectoryepitheliumaspecializedareaofmucousmembrane
inthesuperiorchonchealocatedintheroofofnasalcavity.