Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
What are epithelia? |
Cells that cover or line all the body surfaces, tubes and cavities. Cells that form the interfaces between the different physiological fluid compartments. |
Nah mate |
|
|
What are the characteristics of epithelia |
-Cells are in intimate contact with each other and may be connected by tight junctions. -Epithelial cells are separated from underlying tissues by the basement membrane (BM). -Cells undergo rapid division to replace those continually lost from the surface. |
3 points for this one: -Contact and connections -BM -Division |
|
|
Simple columnar epithelium: 3 Levels of folding |
-Large folds visible to the naked eye -Microscopic Villi covered by a simple columnar epithelium -Microvilli modifications of the apical surface ofnthe epithelial cells, visible only at the electron microscope level |
Think size of the folds |
|
|
Simple columnar epithelium - surface modification |
-Apical surface of each cell is covered by several hundered microvilli forming the brush border, mucus adheres to it -Goblet cells with intensely staining mucus released to lubricate gut contents -Basement membrane (BM) separates the epithelial cells from the underlying tissue |
There are 3 |
|
|
Stratified Squamous Epithelium - The Oesophagus |
-Flattened cells that are worn off and shed from the surface desquamation -Basal cells on the BM divide, move upwards to the surface -Protects underlying tissue from abrasion |
3 Points |
|
|
What is Apical Absorption |
Movement of molecules through the cell bodies |
|
|
|
What is Apical Secretion |
Movement of molecules through the cell body |
|
|
|
What is paracellular movement |
Movement of molecules through the tight junctions between the cells |
|
|
|
What are the major tight junction proteins |
Claudins and occludins |
|
|
|
What are the roles of tight junctions |
-Barriers- separate one compartment from another -Fences- maintain the asymmetric distribution of lipids and proteins in the apical amd basal membranes -Gates- allow some molecules to flow more easily than others |
3 roles |
|
|
What are the names of the domains formed by tight junctions |
Apical and basal membrane domains |
|
|
|
Which types of epithelia allow rapid diffusion? |
Squamous |
|
|
|
Which type of epithelium has a secretory function? |
Pseudostratified cilliated columnar epithelium |
That awkward long ass one |
