High Ca Content of Pacemaker Tissues in the Frog Heart

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 re...

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Veröffentlicht in:	Japanese journal of physiology 1984, Vol.34(6), pp.1117-1121
1. Verfasser:	FUKUDA, Yasuichiro
Format:	Artikel
Sprache:	eng
Schlagworte:	Animals Biological and medical sciences Ca content Calcium - metabolism Extracellular Space - metabolism frog heart Fundamental and applied biological sciences. Psychology Heart Heart Conduction System - metabolism Inulin - metabolism Myocardium - metabolism pacemaker activity Potassium - metabolism Rana Ranidae Sodium - metabolism Tissue Distribution Vertebrates: cardiovascular system
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Zusammenfassung:	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.
ISSN:	0021-521X 1881-1396
DOI:	10.2170/jjphysiol.34.1117