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.
The urethra is also lined with a mucous membrane. Some mucous membranes are involved with digestion in the absorption of insoluble food molecules and secretion (releasing chemicals from glands). The thick fluid secreted by some mucous membranes and/or associated glands is termed mucus. The mucus can be protective.f the lining is torn or broken, mucus is incapable of performing its roles of preventing infection and retaining tissue moisture levels. In the female, the glans clitoridis and the clitoral hood have mucous membranes.