Nonsteady motion in unloaded contractions of single frog cardiac cells
نویسندگان
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 کاملVoltage-tension relations in single frog atrial cardiac cells.
Voltage-clamp experiments were performed on isolated single frog (Rana catesbeiana or Rana pipiens) atrial cells to determine the voltage-contraction relations of the single cardiac cell. The contractile responses of the single cell associated with long duration (3 second) depolarizing steps consisted of a rise to peak (phasic) followed by a decay to a sustained contraction (tonic). These phasi...
متن کاملEffect of external force on relaxation kinetics in single frog atrial cardiac cells.
The effects of external force on relaxation kinetics were investigated in isolated single frog (Rana catesbeiana) atrial cells. We found that force decay occurred at a maximum and constant rate for a significant portion of auxotonic relaxation, and this rate was linearly related to the peak force developed during auxotonic contraction. The slope of the linear relationship between the maximum ra...
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...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 1985
ISSN: 0006-3495
DOI: 10.1016/s0006-3495(85)83801-7