[Evoked automatism (repeated responses) of cat cardiac ventricular fibers].
Repeated responses (RR) of cat papillary muscle fibres have been studied. Threshold current of the occurrence of repeated responses (2t) and saturation current (Is) on the accomodation curve have been determined. Two zones of autooscillations were revealed according to the ratio brage from low levels of the membrane potential (-80 divided by -55 mv). The second RR zone (It is not equal to Is) was activated in more than 70 per cent of preparations in the average from higher levels of the membrane potential (-40 mv and higher). A comparison was carried out between muscle and specialized fibres RR. The experimental data were analysed by the method of phase plane.
D000818:Animals; D002415:Cats; D004285:Dogs; D004558:Electric Stimulation; D004594:Electrophysiology; D006329:Heart Conduction System / Q000502:physiology*; D066298:In Vitro Techniques
Vyzvannaia avtomatiia (povtornye otvety) zheludochkovykh volokon serdtsa koshki