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- W2009705955 abstract "Experiments on the calf muscle circulation of cats and dogs indicate that the return of muscle blood flow to control level during sympathetic vasodilator fibre stimulation (the “escape” phenomenon) occurs only when autoregulation of flow in response to pressure changes is well developed, i.e. when vascular smooth muscle “reactivity” is pronounced. When this is not the case, sustained vasodilatation is induced by prolonged activation of these fibres. The “escape” is therefore dependent on a counterregulation of the vascular effectors themselves. Precapillary sphincter activity is increased by, but does not significantly affect, the neurogenically reduced flow resistance. Further, sphincter activity returns to control when the “escape” develops, showing that this phenomenon is a property of smooth muscle located upstream of the sphincters, in the precapillary resistance vessels proper. The combined evidence suggests a very restricted site of action of the sympathetic cholinergic vasodilator fibres, directly suppressing only “pacemaker” smooth muscle cells and/or key sites of the upstream myogenic propagation of excitation from such pacemakers. Since pacemaker activity seems to be best developed in the smallest precapillary resistance vessels, neurogenic inhibitory action at this site would lead to dilatation of proximally situated resistance sections, which for their basal tone are dependent on propagated excitation. “Escape” would then occur if latent pacemarkers in this resistance section gradually became dominant and reestablished myogenic tone. This is a mechanism very similar to the “vagus escape” phenomenon of the heart." @default.
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- W2009705955 date "1968-01-01" @default.
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- W2009705955 title "Mechanism of Escape of Skeletal Muscle Resistance Vessels from the Influence of Sympathetic Cholinergic Vasodilator Fibre Activity" @default.
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- W2009705955 doi "https://doi.org/10.1111/j.1748-1716.1968.tb03837.x" @default.
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