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25 Cards in this Set
- Front
- Back
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What are epithelial tissues?
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Tissues that cover surfaces or line cavities in order to separate two distinct domains
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What surface of epithelium faces air or fluid?
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Apical
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What is the basement membrane?
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Noncellular domain that is the boundary btw. epi. and underlying connective tissue
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Epithelia are vascular/avascular?
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avascular
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True/False: Epithelia are not capable of extensive and rapid regeneration.
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False. they are
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What does the term epitheliod designate?
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cells that have some, but not all, characteristics of epithelials
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What are the functions of epithelia?
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1.Protection
2.Absorption 3.Secretion 4.Excretion 5.Sensory Reception 6.Surface Transport 7.Contraction 8.Reproduction |
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What designates simple epithelia?
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one layer; cells rest on basement membrane
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Where is simple squamous epithelia commonly located?
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tubules of the kidney
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Where are simple cuboidal epithelia located?
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Many ducts
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What signifies pseudostratified columnar?
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1.Not all cells reach the free surface
2.Nuclei of diff. cell types spaced at diff. intervals |
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Where can pseudostratified columnar epithelium be located?
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In the respiratory system.
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Where is stratified squamous commonly located?
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In areas of wear and tear; skin
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Where is stratified cuboidal commonly located?
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ducts of sweat glands; only 2 layers deep
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Where is transitional epithelium usually located?
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In areas that distention takes place (bladder, etc...)
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Where is stratified columnar commonly seen?
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In large excretory ducts of salivary glands, pancreas, mammaries; usually 2 layers deep
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What types of processes are seen at apical surfaces?
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Microvilli and cilia
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What is microvilli and what is it made out of?
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non-motile;slender cell processes formed by extensions of the plasmolemma
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What is the terminal web?
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the filamentous cytoplasm of microvilli formed from actin and other proteins
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What are cilia?
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Longer than microvilli, motile organelles that aids in moving debree to certain areas.
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What forms the junctional complex?
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1.Zonula occludens (tight junction)
2.Zonula adherens 3.Macula adherens |
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All nutrients and products enter/leave the epithelium through the __________?
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Basement membrane
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What is the BM composed of
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Reticular fibers embedded in a mucopolysaccharide ground substance.
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What are the two layers of the BM?
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1.Basal lamina - contacts epitelials
2.Reticular lamina - doesn't |
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What anchors epithelials to the BM?
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hemidesmosomes
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