Based on the model of the two calcium stores developed by Goldbeter,the influence of external magneticfield on the calcium concentration has been discussed.We believe that the cell membrane is a major site of interactionfor extremely-low-frequency (ELF) electromagnetic fields,and the permeability of ions can be changed with the changingelectromagnetic fields.It is shown that magnetic field initiates intracellular calcium oscillation with a threshold in fluxdensity,and that the calcium oscillations do not occur if the density of magnetic field is below the threshold.Theresults of theoretical calculation are consistent with that of the experiment.The intracellular free calcium concentrationsof different cells exposed to the same magnetic fields are different from each other.It is indicated that the differentbehaviors such as oscillation,rise and invariability of calcium concentration are associated with the sort of cells.
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