Epithelium and Glands Flashcards
1
Q
Features of epithelia
A
- The cells are adjacent to one another and line a surface
- form boundry for the cell
- They sit on a layer of fine filaments
- Control movement
2
Q
3 cell shapes of epithelium
A
- Squamous (simple- blood vessels, straitifed- esophagus, mouth)
- Columnar (digestive tract)
- Cuboidal (kidney)
3
Q
4 ways cells stack in epitherlium
A
- simple- one layer
- Stratified (2 or more; usually >10)
- Pseudostratified (appears to have more than 1 but actually not
- Translational (shape changes; urinary tract)
4
Q
what is the basement membrane
A
Interference bw epithelium and connective tissue
composed by basal lamina and lamina reticularis
5
Q
basal lamina functions
A
- attachment bw connective tissue and epithelium
- Filtration in the kidney
6
Q
Function of junctional complexes
A
- Hold contigous epithelial cells together
- classified into 3 types
7
Q
Occluding Junction
A
- Form impermeable barrier
8
Q
Anchoring Junction
A
- Maintain cell to cell and cell to basal lamina adherence
9
Q
Communicating Junctions
A
-Permitting ions and molecules to pass from cell to cell
10
Q
Zonulae Occlidentes (loc, function)
A
- located on apical portion of cell
- belt like junctions that encircles the whole cell
11
Q
Zonulae adherents (loc, function)
A
- located just basal to the occlidentes
- belt like structure that encricles the whole cell
12
Q
Desmosomes loc, function
A
- located opposite to eachother on the cytoplasmic aspects of adjeacent cells
- Helps resist shearing forces
13
Q
Gap junctions
A
- built by 6 closely packed connexins that assemble to form connexons
- aqueous pores
14
Q
Hemidesmisomes loc, function
A
- serve to attach the basal cell membrance to the basal lamina
15
Q
In which cells would we most likely not see and of the junctional complexes
A
Blood cells
