HUMB1000 Lecture Notes - Lecture 4: Stratified Squamous Epithelium, Nasal Cavity, Nasal Meatus

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Functions of the respiratory system: respiration, ventilation-movement of air in and out of the lungs, external respiration-gas exchange between lungs and blood, transport of the respiratory gases (via blood) Structural classification: upper-nasal cavity, pharynx, larynx, nose, lower-trachea, bronchi, lungs. Functional classification: conducting zone (from nose to bronchi in lungs)- air passes through passages to be warmed, filtered and cleaned, respiratory zone (in lungs)-region where gas exchange occurs between lungs/bronchioles/aveoli and blood. Nose: external nose and the nasal cavity (made of cartilage, nasal cavity. Vestible-entry to nasal cavity (hairy part of nostril) that is lined with stratified squamous epitheleu, sweat glands and sebaceous glands and hair follicles. Hard palate-floor of the nasal cavity made of bone. Concha-bony ridges in the nasal cavity (superior, meddle and inferior), under each choncha are passageways (superior, middle and inferior meatus). Epithelium of chonca is pseudostratified ciliated columnar epithelium. Septum-separates nasal cavity into left and right parts.

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