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epithelial tissue 09

derivation function characteristics

QuestionAnswer
what is histology a conglomeration of cells that perform a particular function
what germ layer is epithelial derived from all 3 germ layers, ectoderm,mesoderm,endoderm
What is the function of epithelial tissue covers and lines, and forms glands
Characteristics of epethelial tissue cells are held closely with little or no intercellular (between cells) matrix.
what are the 3 types of junctions tight junction: holds cells tightly together to prevent leakage.Anchoring junction: allows distention of tissue.Gap or communicating junction: allows spread of electrical and chemical messages from cell to cell.
Desosomes protein welds that hold the cells of the epithelial together.
How are cells arranged in sheets
epithelial has high mitotic ability quickly regenerates because of wear and tear.
epithelial has 2 surfaces apical: top or outer surface(unattached)basal surface:bottom surface(attached to basement membrane.)
what two layers does the basement membrane have? basal lamina which is the top layer, and consists of collagen(protein) and proteoglycans.reticula lamina is the bottom layer which consists of glycoproteins and reticular fibers.
What is the function of the basement membrane: acts as an attachment of epithelial cells at basal surface,Nutrient and waste exchange between the two tissues.serves as a guideline for migrating cells during mitotic division.
epithelial is avasuclar(no blood supply) depends highly on vascularized connective tissue below it to support it and supply nutrients. ( nutrients and waste exchange occurs at the basement membrane that connects the two tissues.
what is classification based on layering affect and cell shape.
what are the 3 layering effects simple- 1 layer thick...allows diffusion, osmosis, secretion, excretion.stratified- 2 or more layers..allows protection and named by cell shape in top layers .pseudostratified-false stratification...appears stratified but is really simple.
Pseudostratified-false stratification appears stratified but is simple. all cells in this tissue come in contact with the basement membrane but do not reach the surface at the same levels.
4 cell shapes squamous, cuboidal, columnar, transitional
squamous flat, tile like cells with a disc shaped nucleus
cuboidal cube shaped with a sperical nucleus
columnar column shaped with an elongated nucleus (close to base)
columnar have 3 modifications associated with them cilia for movement, microvilli enhances surface area for better absorption and goblet cells unicellular epithelial glands and secret mucus for protection
transitional rounded cells, 2 nuclei, allows distention(stretch)
What shapes are in simple layering squamous, cuboidal and columnar
what shapes are in stratified layering squamous, cuboidal, columnar, and transitional
what shapes are in pseudostratified columnar
simple squamous epithelium consists of one layer of flat cells with a disc shaped nucleus. located in alveoli(airsacs), glomerulus of nephrons in kidney, tympanic membrane of eardrum, mesothelium, lining of the heart, blood vessels esp. capillaries, and lymph vessels esp. lacteals
simple cuboidal epithelium consists of one layer of cube shaped cells. location: foms ducts and tubules, capsule of eye lens, surface of ovary, pigmented epithelium of eye, thyroid gland.
simple columnar epithelium consists of one layer of column shaped cells with an elongated nucleus
Created by: JLRoss12
 

 



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