GENERAL HISTOLOGY

Detailed explanation-1: -Integrins are a key component of hemidesmosomes which serve to anchor the epithelium to the underlying basement membrane.

Detailed explanation-2: -At the basal surface of epithelial cells are located: The basement membrane, a thin non-cellular layer, intervenes between the epithelium and the connective tissue. This membrane is 30 to 60 nanometers thick and made up of collagenous and non-collagenous glycoproteins and proteoglycans.

Detailed explanation-3: -Epithelial tissue is polarized. The base of the cell is attached to an underlying basement membrane while the apical end faces free space.

Detailed explanation-4: -The basal lamina is a layer of extracellular matrix secreted by the epithelial cells, on which the epithelium sits. It is often incorrectly referred to as the basement membrane, though it does constitute a portion of the basement membrane.