Module 3 Tissue Flashcards
Group of cells with same parts, function & extracellular substances
Tissue
Microscopic study of tissue structure
Histology
4 basic tissue types
Epithelial, Connective, muscle and nervous
Covering of external and internal surfaces
VERY LITTLE extracellular material space between them
Epithelial tissue (Epithelium/Epithelia)
Partly secreted by epithelial cells
Filter and acts as a barrier to cell movement
Basement membrane
Bind adjacent cells together to form permeability barriers, PREVENT passage of materials
Tight junctions
Small channels that ALLOWS small molecule and ions to pass through
Gap junctions
Mechanical links that bind cells together “belt”
Desmosomes
modified desmosomes thst ANCHOR the cells to the basement membrane
HEMIdesmosomes
Functions of epithelial tissues
- Protection
- Barrier
- Passage
- Secretion
- Absorption
The w classification of epithelia
According to the NUMBER of cell layers
According to the SHAPE of the cells
Single layer of thin, flat cells
Prevents abrasion w organs
Simple squamous epithelium
Cube like shape
Carry out active transport
Simple cuboidal epithelium
Single layer of tall and thin cells
Absorb digested foods
Simple columnar epithelium
Special type of simple epithelium that appears stratified but it’s not
Pseudostratified columnar epithelium
Multi layered CUBOIDAL OR COLUMNAR cells capable of dividing and producing new cells
Stratified squamous epithelium
Multi layered surface columnar cells and irregular or cuboidal deeper layer cells
Stratified cuboidal epithelium
Special type of stratified epithelium that is highly stretchable
As it stretch cells change
Transitional epithelium
Characterized by LARGE amounts of extracellular material that separates cell from one another
Connective tissue
Collagen fibers that is flexible but resist stretching
Protein fibers