Rise in temperature of environment is perceived by thermal receptors, импульсация from them arrives in the centres гипоталамуса. In the answer there is a reflex expansion of vessels of a skin (owing to decrease sympathetic вазоконстрикторного a tone), as a result the skin blood-groove sharply amplifies also a skin gets red colour, еетемпература surplus of heat raises also dissipates from a surface of a body at the expense of thermal radiation, теплопроведения and конвекции. Blood comes back to internal areas of a body on the veins lying under the surface of a skin, passing the counterflow heat exchanger thanks to what the quantity of heat which it receives from arterial blood decreases. The affinity of these veins to a skin surface increases cooling of the blue blood which is coming back to internal areas of a body. At the person the maximum expansion of vessels of a skin from a condition of the maximum narrowing would reduce a combined value of a thermal protection of an integument on the average in time. Not all sites of a surface of a skin it is equivalent participate in теплоотдаче. Brushes of hands have special value, from them can be taken away to 60 % теплопродукции the basic exchange, though their area составляетлишь about 6 % from the general surface of a body. The snail has length of 3,5 mm that makes 2,5 curls. It is divided by two membranes: the basic and a membrane of Rejsnera on three courses or ladders: drum-type, average and vestibular (fig. 32). Vestibular and drum-type ladders at a top of a snail are connected among themselves through геликотрему. Both these ladders are filled перилимфой, similar on a chemical compound with a spinal liquid and containing it is a lot of sodium ions (about 140 mmol/l). According to the theory of an adequate food (A. M.Ugolev), conformity of a set of food substances to fermental structure of digestive system is important. In it it is underlined трехэтапность digestion and necessity of individual adequacy of a food to these stages. For example, at insufficiency лактазы milk is an inadequate kind of food. In this theory it is considered that the primary stream нутриентов is formed as a result of digestion and всасывания food, but except it there is a stream of secondary food substances which is formed as a result of activity of microorganisms of intestines. Substances which possess not only power and plastic value, but also ability to influence many physiological processes (immune, protective, behavioural) are formed of components of food with participation of microorganisms. The peripheral part of the acoustic analyzer or organ of hearing consists of three basic departments:
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