The distinguishing mechanical characteristics of cardiac muscle are(1) the presence of a significant and sometimes labile resting tension at functional lengths. Certain invertebrate skeletal muscles also possess this property, but the structural basis seems to be different. (2)Force-velocity characteristics of heart muscle are labile and constitute a mechanism for regulating cardiac performance. (3)Data on quick-stretch and release show that the active state in heart muscle is slow in its onset, probably preceding the development of isometric tension by only a short time.The onset of the active state is labile also, and probably forms the basis of the regulatory function of the force-velocity relation. Measurements of heat show a slow rate of increase of heat during a twitch consistent with the onset of contractility. © 1967 by the American Society of Zoologists.
CITATION STYLE
Brady, A. J. (1967). Length-tension relations in cardiac muscle. Integrative and Comparative Biology, 7(3), 603–610. https://doi.org/10.1093/icb/7.3.603
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