Abstract

The effects of creatine phosphate on frog heart muscle contraction have been studied further. It has been shown that after inhibition of mitochondrial oxidative phosphorylation by sodium cyanide the frog heart ventricle contraction can be maintained at a high level by addition of creatine phosphate. The effect of creatine phosphate on the contractile force and action potential is similar for frog heart ventricle and atrium. It has been directly demonstrated by using the voltage-clamp technique that creatine phosphate controls the slow inward calcium current through the surface membrane of frog atrium cells.

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