Respiration Lecture 15: Histology Flashcards Preview

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1

respiratory tract

tubular system that extends from nares to lungs

2

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

3

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

20

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

30

2 kinds of macrophages in lung tissue

septal (remains w/n connective tissue septa) and alveolar (on alveolar lining, or free in lumen). Scavenge for particulates and move them upward and out via cilia

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