By measuring telomeres, some scientists believe they can determine biological age, which doesn't always equal chronological age. That means some people may be biologically older or younger than their age, said Jerry Shay, professor and vice chairman of cell biology at UT Southwestern Medical Center in Dallas.
It is of ectodermal origin and is continuous with the skin at various body openings such as the eyes, ears, nose and mouth, the urethral opening and the anus. Some mucous membranes secrete mucus, a thick protective fluid. The function of the membrane is to stop pathogens and dirt from entering the body and to prevent bodily tissues from becoming dehydrated.
Cells in mucous membranes manufacture mucus and proteins important in defense against bacteria, viruses, fungi, allergens and a variety of irritant particulates. Mucus is a clear slippery fluid that coats the respiratory membranes of the sinuses, nose and lungs.Mucus consists of water, blood cells, digestive enzymes, salt, antibodies, dead cells, bacteria and other microorganisms and foreign pollutants.espiratory mucous membranes. Mucous membranes line all of the bony surfaces of the sinus cavities. The lining is similar to the surface lining of the nasal passageways and airways of the lungs. The surface of this membrane is lined with microscopic cilia.