BASICS: Naming the types of Epithelial Tissues
Epithelia
classified based on the number of cell layers and cell shape (1st name of tissue indicates number of cell layers, 2nd name of tissue describes shape of cells)
Columnar cell
column shaped cells
Cuboidal cell
cube shaped cells
Squamous cell
flat cells
Stratified epithelia
has more than one layer of cells
Simple epithelia
has one layer of cells
What are the names of the 2 types of cell layers?
•Simple—one layer of cells •Stratified—more than one layer of cells
What are 5 names of tissues that describes the shape and the way of the cells look (2 are different)?
•Squamous—cells are wider than tall (plate-like) - "squashed" •Cuboidal—cells are as wide as tall, like cubes •Columnar—cells are taller than they are wide, like columns *Transitional--only one that transitions from one shape to another *Pseudostratisfied-only one that has cilia on apical surface
There are 8 types of epithelial tissue
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Stratified Columnar
Many layers of cells but only the surface cells are are columnar; deeper layers are cubodial shaped
Stratified Squamous
Many layers of cells, the basal layer is cuboidal or columnar, becoming flattened (squamous) at the apical surface (named by the cells found at the apical surface); protects against abrasion, forms barrier against infection; outer layer of skin
Pseudostratified Columnar
Single layer of cells; some of these tall & thin cells reach the apical surface, others do not. All are attached to the basal surface with nuclei at different levels making the tissue "appear" stratified
Simple Cuboidal
Single layer of cube-shaped cells; active transport, eases diffusion results secretion; kidney tubules, glands & their ducts
Simple Columnar
Single layer of tall, narrow cells; moves particles out of bronchioles; glands and some ducts
Simple Squamous
Single layer of thin, flat cells; diffusion, filtration, some secretion, some protection; lining blood vessels, the heart, lymphatic vessels
This type of epithelial tissue has only one classification? (It looks like a cuboidal shape, when its not stretched and filled with fliud)
Transitional transitional tissue are stratified cells that appear cuboidal when the organ or tube is not stretched and squamous when the organ or tube is stretched by fluid; found in lining of urinary bladder