In 1909, Western Union and ADT came under the control of American Telephone & Telegraph Company (AT&T). ADT began to expand into new areas, such as fire alarms and security alarms between 1910 and 1930, but was kept separate from AT&T's Holmes alarm business. ADT became a publicly owned company in the 1960s.
It has moist membranes. Many, but not all (urinary), secrete mucous. Serous: Lines open body cavities that are closed to the exterior body surface. composed of simple squamous epithelium resting on thin layer of areolar connective tissue.
Composed of two distinct layers of tissue. 2)connective tissue layer, which is a thin gluelike tissue (basement membrane) that holds and supports the epithelial cells. Purpose: The serous membrane that lines the walls of body cavities is the parietal portion, whereas the visceral portion covers the surface of organs found in body cavities.