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This kind of braking of conditioned reflexes arises at once in reply to action of an extraneous irritant, i.e. is the congenital, unconditional form of braking. Unconditional braking can be external and other-wordly. External braking arises under the influence of the new irritant creating the prepotent centre of excitation, forming a rough reflex. Biological value of external braking consists that, затормаживая current conditioned-reflex activity, it allows to switch an organism to definition of the importance and degree of danger of new influence. The extraneous irritant, making braking impact of a pas a current of conditioned reflexes, is called as an external brake. At repeated repetition of an extraneous irritant the caused rough reflex gradually decreases, and then disappears and any more does not cause braking of conditioned reflexes. Such external braking irritant is called as a dying away brake. If the extraneous irritant contains biologically important information it every time causes braking of conditioned reflexes. Such constant irritant is called as a constant brake. Thus, the structure of final urine depends on filtration processes, реабсорбции and secretions. Primary urine turns in final thanks to processes which occur in nephritic канальцах and collective tubules. In a kidney of the person for days 150 180 l of a filtrate, or primary urine are formed, and allocated 1,0 - 1,5 l of urine. Other liquid is soaked up in канальцах and collective tubules. Канальцевая реабсорбция is a process of the return всасывания water and substances from containing in a gleam канальцев urine in a lymph and blood. The basic sense реабсорбции consists in keeping to an organism all vital substances in necessary quantities. The return всасывание occurs in all departments нефрона. The Great bulk of molecules реабсорбируется in проксимальном department нефрона. Here almost completely реабсорбируются amino acids, glucose, vitamins, fibers, microcells, a significant amount of ions Na +, Сl-, НСО3-и many other substances. In a loop of Genle, дистальном department канальца and collective tubules electrolits and water are soaked up. Earlier considered that реабсорбция in проксимальной parts канальца is obligatory and noncontrollable. Now it is proved that it is regulated as nervous, and гуморальными by factors. For conditioned reflex development it is necessary: