apical membrane definition
Definition. extracellular material secreted by epithelial cells-on basal surface-attach the epithelial cells to underlying tissue-support and guide cell migration during tissue repair. extracellular material secreted by epithelial cells. -on basal surface. A variety of molecules are located at the apical membrane, but only a few key molecules act as determinants that are required to maintain the identity of the apical membrane and, thus, epithelial polarity. These molecules are the proteins Cdc42, atypical protein kinase C (aPKC), Par6, Par3 /Bazooka/ASIP. Adhesion Belt (Function). Holds epithelial cells together in a continuous sheet by forming a complete ring around the apex of the cell. This ring is made of cadherins, which binds to cadherins on other cells and holds them in place. Epithelial cells are one example of a polarized cell type, featuring distinct 'apical', 'lateral' and 'basal' plasma membrane domains. apical membrane, the layer of plasma membrane on the apical side (the side toward the lumen) of the epithelial cells in a body tube or cavity, separated from the basolateral membrane by the zonula occludens. 1  Facebook. Also found in: Wikipedia. the microvilli-bearing portion of the epithelial cell membrane at the secretory pole. the layer of plasma membrane on the apical side (the side toward the lumen) of the epithelial cells in a body tube or cavity, separated from the basolateral membrane by the zonula occludens. Definition. surface of epithelial cell that is exposed to the body exterior or to the cavity of an internal organ -free surface -has microvilli-can also have cilia (hair). surface of epithelial cell that is exposed to the body exterior or to the cavity of an internal organ. -free surface. Where is the basolateral membrane of a cell exactly? Can you guess? Are you sure? This video will hopefully clear things up. 1  Science & Technology. 2  Standard YouTube License. Metaplasia. The change in epithelium from one type to another. Ex: Smokers irritate the linings of their airways enough to induce the change from pseudostratified columnar epithelium to stratified squamous epithelium, which is more resistant to stress. This process is reversible. Epithelial cells connect to one another via their lateral membranes to form epithelial sheets that line cavities and surfaces throughout the animal body.
The layer of plasma membrane on the apical side of the epithelial cells in a body tube or cavity.