STUDIES ON THE CALCIUM PARADOX IN THE ISOLATED HEART OF THE FROG RANA RIDIBUNDA
Abstract
A CALCIUM DEPLETION OF 30 MIN AND A FOLLOWING CALCIUM REPLETION AT A PERFUSION TEMPERATURE OF 37 C DEGREES ARE ESSENTIAL FOR THE INDUCTION OF THE CALCIUM PARADOX IN THE ISOLATED FROG HEART. UNDER THESE EXPERIMENTAL CONDITIONS THE MAXIMUM PROTEIN AND CREATINE KINASE RELEASE FROM MYOCARDIAL CELLS LOSS OF ELECTRICAL AND MECHANICAL ACTIVITY AND INCREASE OF THE RESTING TENSION OF THE MUSCLE WERE OBSERVED DURING CALCIUM REPLETION. DURING CALCIUM DEPLETION A SODIUM AND POTASSIUM INFLUX AND A CALCIUM EFFLUX WERE OBSERVED, WHILE THE FOLLOWING CALCIUM REPLETION RESULTS IN A POTASSIUM AND MAGNESIUM EFFLUX AND A MASSIVE CALCIUM INFLUX. CELLULAR ENERGY STORES ARE INCREASED DURING CALCIUM DEPLETION, WHILE DURING THE FOLLOWING CALCIUM REPLETION THE ENERGY STORES ARE CONSUMED AND AFTER AN INITIAL INCREASE IN ANAEROBIC METABOLISM THE ENERGY PRODUCING PROCESSES ARE INHIBITED. LOSS OF INTRACELLULAR COMPOUNDS IS RESTRICTED TO FREE CYTOPLASMIC CONSTITUENTS AND OCCURS ONLY DURING CALCIUM ...
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