منابع مشابه
Oscillatory afterpotentials in dog ventricular muscle fibers.
Ventricular muscle fibers from dog hearts were superfused with K+-free, high Ca2+ solutions after exposure to a K+-free, Ca2+-free superfusate. Following a series of driven action potentials, oscillatory after potentials (OAPs) were elicited in all 40 preparations at a resting potential of greater than -60 mV. The OAPs appeared not to represent either an electrotonic influence from Purkinje fib...
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The cytological organization of flight muscle fibers of Odonata has been investigated. These fibers, in representatives of the Zygoptera and Anisoptera, have been compared and found to be similar, except that, in the former, pairs of lamellar fibrils, rather than single fibrils, alternate with the mitochondria. In each instance, in these synchronous muscles, the actin filaments of the myofibril...
متن کاملUltrastructural Organization of Obliquely Striated Muscle Fibers in Ascaris Lumbricoides
The somatic musculature of the nematode, Ascaris, is currently thought to consist of smooth muscle fibers, which contain intracellular supporting fibrils arranged in a regular pattern. Electron microscopic examination shows that the muscle fibers are, in fact, comparable to the striated muscles of vertebrates in that they contain interdigitating arrays of thick and thin myofilaments which form ...
متن کاملOuabain-Toxic Canine Purkinje and Ventricular Muscle Fibers
In the "Na lag hypothesis" of cardiac glycoside action, [Ca]i increases through sodium-calcium exchange following block of the sodium-calcium ATPase. This accumulation of [Ca]i has been suggested to be responsible for digitalis-induced delayed afterdepolarizations and arrhythmias. We used standard microelectrode techniques to study the effects of adriamycin, 10-200 fiM, on the canine Purkinje f...
متن کاملCARDIAC MUSCLE A Comparative Study of Purkinje Fibers and Ventricular Fibers
With light and electron microscopy a comparison has been made of the morphology of ventricular (V) and Purkinje (P) fibers of the hearts of guinea pig, rabbit, cat, dog, goat, and sheep. The criteria, previously established for the rabbit heart, that V fibers are distinguished from P fibers by the respective presence and absence of transverse tubules is shown to be true for all animals studied....
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ژورنال
عنوان ژورنال: Circulation Research
سال: 1977
ISSN: 0009-7330,1524-4571
DOI: 10.1161/01.res.40.5.525