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- W60645872 abstract "Recordings of the electrical activity of gut muscles show spontaneous periodic oscillations called slow waves or Electrical Control Activity (ECA). The slow waves are related to oscillations of the membrane electrical potentials; thus, they are myogenic in nature and persist after anatomic and pharmacological denervation. In intact segment the frequency of slow waves decreases aborally in the stepwise fashion, with variable lengths of intestine having the same frequency (plateau areas). When the intestine is cut into small segments the slow wave frequency of each consecutive segment decreases aborally in linear fashion. These phenomena were largerly investigated in literature and were explained on the assumption that intestinal smooth muscle can be regarded as a series of loosely coupled oscillators having successively decreasing intrinsic frequencies. In a frequency plateau, individual oscillators are driven by the oscillator with the highest intrinsic frequency which assumes the role of pacemaker for the next frequency plateau. It follows that there are multiple pacemaker areas, of decreasing frequency, situated at various levels of the intestine. This areas can be variable in time and position since each cell or group of cells of the intestinal tissue can act as a pacemaker. Superimposed on the slow waves and in relationships with them, burst of spikes, associated with contraction, also appear in the recordings. Spiking activity is due to a fast membrane depolarization of the smooth muscle cells and occurs generally at the peak of the slow waves since the excitability of the tissue is maximal at this time (1). Thus, the slow waves have a pacing role with respect to the mechanical activity, but, in general, they do not give rise to a contraction. The phase locking of the slow waves at the plateau areas of an intestinal segment seems to the basis for the occurence of propagated spike burst." @default.
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- W60645872 date "1996-01-01" @default.
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- W60645872 title "Duodenal Bioelectrical Waxing and Waning Activity" @default.
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- W60645872 doi "https://doi.org/10.1007/978-3-322-85017-1_26" @default.
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