BIOB34H3 Lecture Notes - Stratified Squamous Epithelium, Lingual Tonsils, Olfactory Mucosa
Document Summary
Two zones: conducting zone (air passages, respiratory zone (site of gas exchange) Function: gas exchange (o2 in, co2 out, other functions such as acid/base balance, route for water and heat loss. Functions: airway, moistens, warms and filters air. External nose: bone and hyaline cartilage. Epiglottis: elastic cartilage flap that prevents food from entering trachea. Glottis: contains the vocal folds, elastic fibers running between cartilages under the mucosa, vibrate as air passes by, space between called rima glottidis. Mucosa above vocal folds is stratified squamous, below is pseudostratified ciliated columnar: trachea. Three layers: mucosa, pseudostratified ciliated columnar, lots of goblet cells, submucosa, areolar ct, seromucous glands, adventitia, ct with rings of hyaline cartilage, cartilage keeps trachea open. Secondary bronchi are branches that supply each lobe of lung (3 right, 2 left) Right and left primary bronchi: bronchi and bronchial tree. Branches finally lead to bronchioles which are <1 mm in diameter.
