Flashcards in Respiration Lecture 15: Histology Deck (44)
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respiratory tract
tubular system that extends from nares to lungs
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Functions of resp. tract
1) warm/moisten air
2) detect odorant molecules
3) conduct air to lungs
4) gas exchange with blood
5) minimize entry of ingested food and fluid
6) produce vocalizations
7) trap/eliminate foreign particles
8)combat microbes
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Type of epithelium in vestibular region
nonkeratinized stratified squamous epithelium
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2 types of epithelium in respiratory region
respiratory + olfactory ep.
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4 main components of nasal cavity
1) vestibular region
2) respiratory region
3) paranasal sinuses
4) vomeronasal organs
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philtrum
area between nostril and mouth
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respiratory epithelium =
pseudostratified ciliated columnar epithelium
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4 main cell types found in resp. ep.
goblet, ciliated, basal, and brush cells
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olfactory epithelium =
pseudostratified ciliated columnar epithelium
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3 main cell types found in olfactory ep.
sustentacular, olfactory, and basal cells. NO GOBLET CELLS
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where are Bowman's glands found and what do they do?
Beneath olfactory epithelium; secretion dissolves odor-producing substances
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Paranasal sinuses fx
provide thermal and mechanical protection to orbits, nasal and cranial cavities; add resonance to vocalizations
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T or F: pig has more extensive paranasal sinus than dog
T
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What is paranasal sinus lined by?
Resp. ep.
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What is vomeronasal organ lined by?
Resp. and Olf. ep., cartilage
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vomeronasal organ fx
detect pheromones involved in social and mating behaviors
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What is nasopharynx lined by?
resp. ep. (pseudostratified ciliated columbar ep.) Is around the soft palate
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What is larynx lined by?
stratified squamous and resp. ep.
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Epiglottis is lined by:
Non-keratinized stratified squamous epithelium that interdigitates with the lamina propria
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Epithelium in trachea
respiratory ep.
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where is trachealis m. in dog vs. ox?
dog-outside smooth muscle ring; ox-inside ring
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Tunic layers from inside to outside of tubular organ (4)
1)Tunica mucosa (lines lumen)
2)Tunica submucosa (often contains glands)
3)Tunica muscularis
4) Tunica serosa or adventitia
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Main secretory cell type in tracheal epithelum of domestic mammals
goblet cells
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lamina muscularis mucosae in trachea contains
elastic fibers
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muscularis externa in trachea contains
joining of trachealis m. and cartilage
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conducting airways of bronchial tree
trachea + extrapulmonary bronchus
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transitional/respiratory bronchioles
char. by direct attachment of alveoli; not present in all species. Between terminal bronchioles and alveolar ducts. Participate in gas exchange
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Granular (Type II Pneumonocytes)
Thicker and less numerous than Type I. Secrete surfactant. Aka septal cells
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Membranous (Type I) pneumonocytes
squamous cells that line alveolar wall. Thin cells, where gas exchange takes place. Surround capillaries
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