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.
Most of the nasal and paranasal sinus cavities contain repiratory epithelium, that is pseudo-stratified columnar ciliated epithelium with many goblet cells (mucus producing). This respiratory epithelium continues down the whole respiratory tract. Respiratory mucous membrane, lines the lower part of the cavity.Its function is to warm, moisten and clean inspired air: 1  The warming is accomplished with the presence of a plexus (collection) of veins in the submucous connective tissue (which is why you bleed so much when you get a nose bleed).ost of the nasal and paranasal sinus cavities contain repiratory epithelium, that is pseudo-stratified columnar ciliated epithelium with many goblet cells (mucus producing). This respiratory epithelium continues down the whole respiratory tract. Respiratory mucous membrane, lines the lower part of the cavity.