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.
1 Epithelial cells form the thin layer of cells known as the endothelium, which is continuous with the inner tissue lining of organs such as the brain, lungs, skin, and heart. 2  The free surface of epithelial tissue is usually exposed to fluid or the air, while the bottom surface is attached to a basement membrane. For example, the skin is composed of a layer of epithelial tissue (epidermis) that is supported by a layer of connective tissue. 2  It protects the internal structures of the body from damage and dehydration.