PMID: 6535864Jan 1, 1984Paper

High Ca content of pacemaker tissues in the frog heart

The Japanese Journal of Physiology
Y Fukuda

Abstract

Cation contents of various cardiac regions were determined in the isolated perfused bullfrog heart. The Ca content was much higher in the pacemaker tissues (sinus venosus and atrio-ventricular ring muscle) than in the atrial or ventricular muscles even with extracellular Ca deficiency. A possible relationship between stored Ca and spontaneous pacemaker activity is discussed.

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