13. What is the role of mineral
salts in the creation of electric
tension (voltage) at the
cellular level?

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The activity of the cell, for
example, in neurons, depends on the
different concentrations of positive and
negative between the inner and the
outer surfaces of the cell .
salts are responsible for that
voltage.

The cell membrane of non-excited cell
has commonly a inner side and
a outer side. This electrical
situation is maintained by ion
across the membrane.