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“In the erythrocytes, a five-minute exposure to 10 mM NaF caused a 50% increase in extracellular potassium concentrations after 12 hours compared to control erythrocyte suspensions (P less than .001).”
“At high concentrations of sodium fluoride there was an increased leak of potassium from platelets, which was further augmented by addition of calcium to the medium.”
The Journal of laboratory and clinical medicine • 1967 | View Paper
“Contrarily, NaF in higher concentrations produced an inhibition of contractile tension associated with a shortening of action potential, an increase in potassium conductance, and an inhibition of calcium response.”