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ch4 tissues
| Term | Definition |
|---|---|
| tissues | a group of cells similar in structure that perform a common or related function |
| epithelial tissue | covering and lining tissue; ex digestive, urogenital, respiratory, outer skin. 2 fashions glands (glandular) |
| apical surface | an upper free surface exposed to eh body exterior or the cavity of an organ |
| basal surface | the lower attached part |
| basal lamina | thin supporting sheet, adjacent to the basal surface, consists of glycoproteins, selective filter to the epithelium, scaffolding to migrating cells for repair |
| basement membrane | formed by laminae, reinforces epithelial sheet, helps resist stretching and tearing and defines epithelial boundary |
| simple | single layer; absorption, secretion, and filtration |
| stratified | two or more |
| squamous | flattened and scale like |
| cuboidal | box like, as tall as they are wide |
| columnar | tall column shaped |
| simple squamous epithelium | flattened laterally, and cytoplasm is sparse; filtration, exchange of substance |
| endothelium | inner covering |
| mesothelium | middle covering |
| simple cuboital epithelium | single layer of cells as tall as they are wide, darkened round nuclei; secretion and absorption |
| simple columnar epithelium | single layer of tall close packed cells; absorption and secretion; have microvilli and goblet glands |
| pseudostratified columnar epithelium | single layer, differing height, false impression of many layers; secretes and absorbs, may have mucus secreting cells |
| stratified squamous epithelium | several layers, thick; protective role. basal are cuboital or columnar, apical is flattened |
| stratified cuboidal or columnar epithelium | two layers, rare, found in glands |
| transitional epithelium | resembles all but the surface is dome shaped usually, has the ability to stretch shape depends on stretch |
| gland | consist of one or more cells that make and secrete a particular product. |
| endocrine glands | produce hormones and eventually lose their ducts, hence ductless |
| exocrine glands | secret their products onto body surfaces or body cavities. |