Abstract
In the autorhythmical activity underlying many visceral and in early ontogenesis also somatomotor systems, three kinds of rhythms are to be distinguished: basic, reflecting activity of individual organs and of systems of organs, the secondary ones representing result of the frequency and amplitude modulation of the basic rhythms, and the rhythmical periodic activity whose distinguishing feature is alternation of the activity and rest phases. Each kind has principally different frequency characteristics, different organization and localization of sources. The frequency of basic rhythms is determined by the generator inserted into the system. It serves an individual characteristics of the current state of function of the organ, the degree of maturity of its motor apparatus. The secondary rhythm and the rhythm of the periodic activity cycles are provided by oscillatory processes common to the whole organism. Universality of these rhythms promotes integration of functions.
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