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Science 27 May 1966:
Vol. 152. no. 3726, pp. 1242 - 1243
DOI: 10.1126/science.152.3726.1242
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Articles

Control of Myocardial Contraction: The Sensitivity of Cardiac Actomyosin to Calcium Ion

Arnold M. Katz 1 and Doris I. Repke 1

1 Department of Physiology, College of Physicians and Suirgeons, Columbia University, New York 10032

The control by calcium ion of the adenosine triphosphatase activity of cardiac actomyosin is similar to that of white skeletal actomyosin. This finding indicates that the slower contraction and relaxation of heart muscle do not reflect different levels to which free calcium ion concentration around the myofibrils must be adjusted during contraction and relaxation and suggests a mechanism whereby myocardial contractility may be regulated.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Sensitivity of Cardiac Actomyosin to Calcium.
B. L. Fanburg (1966)
Science 154, 1208
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Science. ISSN 0036-8075 (print), 1095-9203 (online)