Physiology of the skin

  • The structure of the skin
  • Skin tumors
  • One of the main functions of the skin is a protective (body protection). So, tension, pressure, bruises neutralized elastic fat bottoms and elasticity of the skin. Normal corneal layer protects the deeper layers of skin from drying out and very resistant to various chemicals. Pigment melanin absorbs ultraviolet rays, protects the skin from sun exposure. Especially important are sterilizing properties of the skin and resistance against different bacteria. Intact stratum corneum impervious to infections, and sebum and sweat create an acidic environment unfavourable for many microbes.
    An important protective function of the skin is its participation in the thermoregulation (maintenance of normal body temperature). 80% of all the heat transfer of the body is the skin. At high ambient temperature of the skin dilate the vessels and increases heat dissipation. At low temperature vessels are narrowed, the skin turns pale, the heat transfer is reduced. Heat is also evaporation of sweat. Teploregulyation is due to irritation or temperature receptors of the skin (i.e. reflex), or directly teploreguliruth centers.
    Secretory function is sebaceous and sweat glands. Sebum is a complex chemical composition of fatty substance, forming together with then a thin film, playing a major role in maintaining the normal physiological condition of the skin. With sebum may yield some medicines (iodine, bromine and other), and toxic substances. Secreted by the sweat glands pot consists of water (98-99%) and the dry residue of inorganic and organic substances (sodium chloride, chloride, potassium, urea, ammonia, etc.). Chemical composition of sweat unstable and varies depending on metabolism in the body. The function of the sweat glands is regulated by the sympathetic nervous system.
    Receptor function of the skin is the perception from the outside and transfer to the Central nervous system of a range of sensations. The following types of skin sensitivity: 1) tactile (see the sense of Touch); 2) pain; 3) temperature feeling of heat and cold.
    Metabolic function is to participate in the regulation of metabolic processes in the body, especially water, mineral and carbohydrate.