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