epithelial tissue 09 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
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
Popular Anatomy sets