The saliva is a source of calcium, phosphorus, zinc for formation of enamel of tooth. In mechanisms реабсорбции water and sodium ions, and also концентрирования urine work of so-called povorotno-counterflow multiplying system has great value. The Povorotno-counterflow system is presented in parallel races-put by knees of a loop of Genle and a collective tubule on which the liquid moves divergently (противоточно). Эпителий descending department of a loop passes water, and эпителий an ascending knee it is impenetrable for water, but it is capable to transfer actively sodium ions to a fabric liquid, and through it back in blood. In проксимальном department occurs всасывание sodium and water in equivalent quantities and wetting here изотонична to blood plasma. In descending department of a loop нефрона реабсорбируется water and urine becomes more concentrated (hypertensive). Water return occurs passively because in ascending department simultaneously is carried out active реабсорбция sodium ions. Arriving in a fabric liquid, sodium ions raise in it osmotic pressure, thereby promoting pulling in a fabric liquid of water from descending department. At the same time increase of concentration of urine in a loop нефрона for the account реабсорбции waters facilitates transition of sodium from urine in a fabric liquid. As in ascending department of a loop of Genle реабсорбируется sodium, urine becomes гипотоничной. Arriving further in the collective tubules representing the third knee of counterflow system, urine can strongly concentrate, if operates АДГ, raising permeability of walls for water. In this case in process of advancement on collective tubules in depth of brain substance more and more water leaves in the interfabric liquid which osmotic pressure is raised owing to the maintenance in it of considerable quantity Na+и of urea, and urine becomes more and more concentrated. coreg Sometimes during a dream so-called partial wakefulness which speaks presence of certain channels of reverberation возбуждений between subcrustal structures and a bark of the big hemispheres during a dream against decrease in ascending activating influences ретикулярной formations on a brain bark is observed. For example, feeding mother can strong sleep and not react to strong sounds, but she quickly wakes up even at small шевелении the child. In case of pathological changes in wearied other body strengthened импульсация from it can define character of dreams and to be some kind of the disease harbinger which subjective signs are not perceived yet in a wakefulness condition.
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