Article: article from journal or magazin.
Relaxation of frog myocardium
Recent Advances in Studies on Cardiac Structure and Metabolism
Journal Article --- Old month value: May 26-29
Tension fall of frog heart contraction was analyzed under voltage-clamp conditions. It appears mostly exponential. The rate of relaxation depends upon the extracellular and intracellular Na concentrations. This suggests that the relaxation is under the control of Na-Ca exchange. The speeding up of relaxation by adrenaline in frog heart is revealed by low Na solution, while it is hidden by the primordial Na-Ca exchange in Ringer's solution.
Animals Anura Biological Transport Calcium/metabolism Epinephrine/pharmacology *Myocardial Contraction/drug effects Myocardium/metabolism Rana pipiens Sodium/metabolism Veratrine/pharmacology
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