The membrane capacity of frog twitch and slow muscle fibres.
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چکیده
منابع مشابه
A Comparison of the Fine Structures of Frog Slow and Twitch Muscle Fibres
The organisation of the myofibrils and the sarcoplasmic reticulum in frog slow muscle fibres has been compared with that in twitch fibres. It has been found that the filaments have the same length in the two types of fibre, but that there are differences in their packing: (a) in contrast to the regular arrangement of the I filaments near the Z line in twitch fibres, those in slow fibres are irr...
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An unusual histological appearance was found by Krfiger (1929) and by Fiirl inger (1930) (see also Krfiger et al., 1933, and Krfiger, 1952) to be characterist ic of a propor t ion of the muscle fibers in those muscles of the frog tha t are able (Sommerkamp, 1928) to give long lasting, slow contractions. This unusual appearance was named "Fe lders t ruk tur" to distinguish it from the usual "F i...
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Inactivation of slow Ca2+ channels was studied in intact twitch skeletal muscle fibers of the frog by using the three-microelectrode voltage-clamp technique. Hypertonic sucrose solutions were used to abolish contraction. The rate constant of decay of the slow Ca2+ current (ICa) remained practically unchanged when the recording solution containing 10 mM Ca2+ was replaced by a Ca2+-buffered solut...
متن کاملCalcium Efflux from Frog Twitch Muscle Fibers
An apparatus is described which collects the effluent from the center 0.7 cm of a single muscle fiber or bundle of muscle fibers. It was used to study the efflux of (45)Ca from twitch muscle fibers. The efflux can be described by three time constants 18 +/- 2 min, 300 +/- 40 min, and 882 +/- 172 min. These kinetics have been interpreted as those of a three-compartment system. The fastest is tho...
متن کاملSlow and fast fatigable frog muscle fibres: electrophysiological and histochemical characteristics.
Continuous activity of isolated frog gastrocnemius muscle fibres provoked by repetitive stimulation of 5 Hz was used as an experimental model for fatigue development in different fibre types. Parameter changes of the elicited intracellular action potentials and mechanical twitches during the period of uninterrupted activity were used as criteria for fatigue evaluation. Slow fatigable muscle fib...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1965
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1965.sp007764