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This study analyzed the effects of temperature on cardiac function of Piaractus mesopotamicus. The data suggest that the heart performance during temperature elevations is regulated mainly by chronotropic adjustments and that increased extracellular Ca 2+ concentrations and high adrenaline can improve inotropism at high temperatures. When stimulation frequency was increased, a negative...
This study analyzed the impact of changes in stimulation frequency on the inotropic responses of the South American lungfish Lepidosiren paradoxa ventricle strips. The effects of prolonged diastolic pauses and stepwise increases in stimulation frequency upon force development were determined at different temperatures (15 o C, 25 o C, and 35 o C) and in response to 10μM of ryanodine...
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