The epidermis contains no blood vessels, and cells in the deepest layers are nourished almost exclusively by diffused oxygen from the surrounding air and to a far lesser degree by blood capillaries extending to the upper layers of the dermis.he dermis is the layer of skin beneath the epidermis that consists of epithelial tissue and cushions the body from stress and strain. The dermis is tightly connected to the epidermis by a basement membrane. It also harbors many nerve endings that provide the sense of touch and heat.
Polio is a disease caused by a virus that affects the nervous system and is mainly spread by person-to-person contact. Polio can also be spread by drinking water or other drinks or eating raw or undercooked food that are contaminated with the feces of an infected person.Most people with polio do not feel sick.Some people have only minor symptoms, such as fever, tiredness, nausea, headache, nasal congestion, sore throat, cough, stiffness in the neck and back, and pain in the arms and legs. Most people recover completely.ost people with polio do not feel sick. Some people have only minor symptoms, such as fever, tiredness, nausea, headache, nasal congestion, sore throat, cough, stiffness in the neck and back, and pain in the arms and legs. Most people recover completely.
Polio, also called poliomyelitis is a highly contagious infectious disease caused by one of three related viruses. Polio is a very serious disease, which can lead to paralysis or even death. Once a person is exposed to polio, it usually takes about three to five days for symptoms to appear. In about 95 percent of polio cases, infection from the polio virus causes no symptoms or serious effects. In about 5 percent of cases, the polio virus manifests in a mild form (abortive polio) with flu-like symptoms, in a nonparalytic form (aseptic meningitis) or in a severe form called paralytic polio. People who have minor or nonparalytic forms recover completely.