Internal viscoelastic loading in cat papillary muscle
نویسندگان
چکیده
منابع مشابه
Effects of altered loading on contractile events in isolated cat papillary muscle.
When the mode of contraction of the cat papillary muscle is changed abruptly from isotonic to isometric, the tension of the first isometric contraction is as much as 22% greater and lasts substantially longer than the subsequent stable isometric contractions attained after a few beats. This previously undescribed phenomenon is largely independent of preload or inotropic influences, but is great...
متن کاملLength-dependent calcium inotropism in cat papillary muscle.
We studied changes in the relationship of isometric developed force to muscle length when extracellular calcium concentration was altered in isolated cat papillary muscles. In two series of experiments at temperatures of 30 degrees C and 32 degrees C, and rates of 12 and 30 beats/min, 21 muscles were exposed to calcium concentrations of 1.125, 2.25 and 4.5 mM. Muscle lengths were varied between...
متن کاملRestitution of the action potential in cat papillary muscle.
BASS, kz G. htitution of the action potential in cat papillary muscle. Am. J. Physiol. Z%(6) : 17 17-l 724. 1975.-Membrane recovery (electrical restitution) following an action potential (AP) was studied in isolated, electrically driven cat papillary muscle by interpolation of test extrasystoles at various delays in the interval between two AP’s (recorded with glass microelectrodes). Curves des...
متن کاملTHE ULTRASTRUCTURE OF THE CAT MYOCARDIUM I. Ventricular Papillary Muscle
The ultrastructure of cat papillary muscle was studied with respect to the organization of the contractile material, the structure of the organelles, and the cell junctions . The morphological changes during prolonged work in vitro and some effects of fixation were assessed. The myofilaments are associated in a single coherent bundle extending throughout the fiber cross-section. The absence of ...
متن کاملThe diastolic viscous properties of cat papillary muscle.
The measurement of ventricular diastolic compliance is complicated by the presence of viscous properties. To approach this problem, cat papillary muscles contracting isometrically at 15/min at 26 degrees C were stretched at different velocities during diastole. At a given length there was no excess of force above that defined by the static force-length curve until velocity of stretch exceeded 1...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Biophysical Journal
سال: 1982
ISSN: 0006-3495
DOI: 10.1016/s0006-3495(82)84465-2