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.
exists and is an alternate of . Making the world better, one answer at a time. 1) Position -- Mucous membranes line cavities that connect with the exterior, including the digestive, respiratory, reproductive, and urinary tracts. Serous membranes line the sealed, internal cavities of the body. the pericardium lines the pericardial cavity and covers the heart. 2) Function -- Mucous membranes protect the tracts from mechanical factor, chemical substances, and microorganism invasion. Serous fluid covers the surfaces to minimize friction between opposing surfaces. 3) Types -- Mucous membranes: simple epithelia, stratified squamous epithelium, the transitional epithelium. Serous membranes: there are parietal and visceral portions. Parietal lines the outer wall of the internal chamber.