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. |