[The quasi-resonance dependence of the arrhythmogenic action of a low-frequency magnetic field on myocardial contractile activity].

Non-monotonous quasi-resonance dependences of arising of arrhythmias on frequency and tension of magnetic field have been studied. Maximal effect was observed at 0.15 E and 40 Hz with 70% probability of the effect.

[Insulin regulation of 2 kinetically different types of calcium current].

At least two kinetically different kinds of calcium current are shown to exist in the frog atrial cells. The current with faster activation kinetics is usually depressed by insulin. Insulin also increases the amplitude of the slower calcium current.