Characteristics of sarcomere shortening in single frog atrial cardiac cells during lightly loaded contractions.
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چکیده
منابع مشابه
Characteristics of sarcomere shortening in single frog atrial cardiac cells during lightly loaded contractions.
We studied sarcomere performance in single isolated intact cardiac cells using techniques that allow direct measurement of sarcomere length and force. This investigation dealt primarily with sarcomere performance during twitch contractions under lightly loaded conditions. In such contractions, there was a significant portion of the contraction in which sarcomere shortening occurred at constant ...
متن کاملEvidence that the velocity of sarcomere shortening in single frog atrial cardiac cells is load dependent.
Recent experiments using laser diffraction techniques to determine the time course and extent of sarcomere shortening in thin bundles of cardial tissue have given results which suggest that the velocity of sarcomere shortening in cardiac muscle is independent of the developed force (Nassar et al., 1974; Krueger and Pollack, 1975). However, the anatomical complexity of the intact tissue preclude...
متن کاملEvidence That the Velocity of Sarcomere Shortening in Single Frog Atrial Cardiac Cells is Load Dependent
during isometric contraction. J Physiol (Lond) 251: 627-643 Krueger JW, Wittenberg BA (1978) Dynamics of myofilament sliding in single intact cardiac muscle cells (abstr). Circulation 58: (suppl II): 33 Lapicque L (1907) Recherches quantitative sur l'excitation electriquer des nerfs traitee comme une polarisation. J Physiol (Paris) 9: 620-635 Manring A, Nassar R, Johnson EA (1977) Light diffrac...
متن کاملSarcomere length-resting tension relation in single frog atrial cardiac cells.
It generally has been thought that the relatively high resting tension characteristic of cardiac tissue resides in structures (collagen, elastin) external to the individual cardiac cells, but the evidence to support this conclusion has been indirect, since the resting tension of intact single cardiac cells has not been determined previously. The purpose of the present investigation was to deter...
متن کاملEffect of initial sarcomere length on sarcomere kinetics and force development in single frog atrial cardiac cells.
We studied sarcomere performance in single isolated intact frog atrial cells using techniques that allow direct measurement of sarcomere length and force. The purpose of this investigation was to determine whether length-dependent alterations in contractile activation occur in the single isolated cardiac cell. This was accomplished by determining the effect of initial sarcomere length on the ti...
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ژورنال
عنوان ژورنال: Circulation Research
سال: 1981
ISSN: 0009-7330,1524-4571
DOI: 10.1161/01.res.48.2.189