Estíbaliz López

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The twitch contractions of single fibres from the frog semitendinosus, innervated and denervated, were studied after a brief period (2-3 sec) of conditioning stimulation (CS), at frequencies varying from 1-120/sec. Twitch potentiation was consistently observed in denervated fibres at all rates of CS used. Maximal potentiation was attained within the first(More)
Denervated frog's semitendinosus muscles were studied. Fibrillation potentials generate propagated spikes which are conducted at a rate similar to that calculated for innervated muscles. The twitch tension per unit area was similar in denervated and innervated single fibres; the average value corresponded with values reported in the literature for fibres(More)
The perfused heart in situ and strip preparations were used. In the in situ preparation, low-Na hypoosmotic saline had a positive inotropic effect, shortened the A-V interval and abolished arrhythmia or A-V blocking. The return to normal saline caused a transient off-response: further acceletation of the heartbeat and further shortening of the A-V interval.(More)
Denervated frog's semitendinosus muscles were studied. No differences in resting potential were found between denervated and control fibres. Spontaneous discharges of fibrillation potentials were recorded from random points along the length of denervated fibres. The frequency of the potentials varied between 2 and 30/sec; the duration of the discharges(More)