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basal lamina
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A&P chpt 4 epith tis
| Question | Answer |
|---|---|
| Glands | Structures that produce fluid secretions; they are either attached to or derived from epithelia |
| basal lamina | aka basement membrane. a complex structure produced by the basal surface of the epithelium and the underlying connective tissue |
| Cell adhesion molecules (CAMs) | Transmembrane proteins which bind to each other and to extracellular materials |
| Intercellular cement | a thin layer of proteoglycans that contain polysaccharide derivatives; may bond membranes of adjacent cells |
| hyaluronan (hyaluronic acid) | polysaccharide derivatives contained inside of intercellular cement |
| cell junctions | specializd areas of the plasma membrane that attach a cell to another cell or to extracellular materials |
| occluding (tight) junctions | where the lipid portions of the two plasma membranes are tightly bound together by interlocking membrane proteins; adhesion belt forms a band that encircles cells and binds them to their neighbors |
| gap junction | where two cells are held together by interlocking junctional proteins called connexons |
| desmosome | where CAMs and proteoglycans link the opposing plasma membranes. very strong and can resist stretching and twisting |
| germinative cells | most stem cells that are located near the basal lamina, in a relatively protected location |
| endocrine glands | produces secretions, which are released directly into the surrounding interstitial fluid |
| exocrine glands | produce exocrine secretions, which are discharged onto an epithelial surface |
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