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Studies have been made on chrono- and inotropic effects in the heart of the frog Rana temporaria and fishes Silurus glanis and Cyprinus carpio during stationary and transitional stimulation. In contrast to data in the literature, no interspecific differences were found in changes of the amplitude of cardiac contractions induced by changes in rhythmic(More)
Chrono-ionotropic interrelationships were studied in isolated strips of the myocardium of poikilothermous animals (frogs and fishes) in conditions of either stationary or transitional regimens of stimulation. In the stationary regimen, the rhythm-strength relation is simple and corresponds to a parabolic curve. While changing the lesser frequency of(More)
Isolated strips of the heart auricles and ventricles of frogs at high stimulation frequencies revealed rest potentiation which depended both on the stimulation rhythm and on the duration of rest interval. Amphibians as well as warm-blooded animals and fish seem to display a possibility of Ca++ entering a cell during the period of rest via non-electrogenic(More)
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