Epithelial tissues- BY 201
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16 terms
Terms | Definitions |
|---|---|
 simple squamous | 1 layer thick; flattened in shape; used in diffusion and filtration; found in air sacs in lungs, lining of blood vessels (exchange takes place in capillaries) |
| simple cuboidal | Single layer of cube shaped cells, usually with spherical nuclei. Covers ovaries and lines most of the kidney tubules and the ducts of certain glands. |
| simple columnar | single layer of column shaped cells. Secretion (mucous) and absorption. Surface lining of stomach and intestines. |
| pseudostratified columnar | looks stratified or looks like in layers, but really just odd shaped columnar cells with nuclei located in different parts of each cell. Found in the cells of the respiratory system. |
| stratified squamous | layers of flattened cells; used in protection (covers areas of high abrasion); found in skin and upper digestive tract (mouth, esophagus) |
| stratified columnar | Located in pharynx (back of throat), male urethra; 2 or more layers of elongated column-shaped cells; many layers of column shaped cells |
| stratified cuboidal | 2-3 layers of cubed shaped cells, lines ducts of mammary, salivary and sweat glands |
| transitional | Stretch and permit distension; lines the ureters, baldder and parts of the urethra |
| glandular epithelium | composed of cells that are specialized to produce and secrete substances into ducts or into body fluids |
| merocrine | cell secretes only fluid |
| types of merocrine fluids | serous fluid: watery Mucous: thicker, contains mucin- a soluble protein |
| apocrine | cell secretes part of it's cytoplasm; in mammary glands and some sweat glands |
| holocrine | entire cell is secreted; sebacous gland |
| epithelial tissue | lines cavities, surfaces, and forms glands; lack blood vessels; continually dividing; tightly packed |
| lamina propria | glue-like material that attaches epithelial tissue to the tissues beneath |
| desmosomes | attach epithelial tissue cells together |
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