ashwagandha The attention is a concentration of mental activity on certain object. By means of attention selection of the necessary information is provided. Nejrofiziologichesky mechanisms of attention are connected with displays of a rough reflex, with local processes of activation of a cerebral cortex, and also with emotional conditions and biological requirements of an organism. The selective attention is possible only at a condition raised, but not excessively high wakefulness which on ЭЭГ is characterised high-frequency десинхронизированными by fluctuations of low amplitude with rare occurrence of groups of the synchronised alpha will. To diffuznym forms of attention there correspond conditions of the weakened wakefulness with accurately expressed synchronised alpha rhythms. The absent-minded attention often arises in a condition of strong excitation, thus on ЭЭГ electric activity is registered десинхронизированная high-frequency низкоамплитудная. Anatomic substratum of regulation of various forms of attention is ретикулярная the formation of a trunk of a brain, диффузная таламическая system, субталамус and гипоталамус. Nonspecific таламическая the system is considered as the filtering mechanism possessing ability to switch attention from one irritants on others. Associative zones of a bark are the central link in system of the mechanisms regulating selection of the information, selective forms of perception, attention and consciousness. Localisation and functional properties respiratory нейронов Are available диуретики which increase allocation only sodium ions, and allocation of ions of potassium even decreases. These are so-called калийсберегающие диуретики. They operate in area дистальных канальцев in places where sodium and potassium ions exchange. These substances (триамтерен, амилорид) reduce permeability of cellular membranes эпителия дистальных канальцев for sodium ions. Secretion of ions of potassium in дистальных канальцах goes down.
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