In most resting cells, the concentration of sodium ions is higher outside of cells compared with the intracellular fluid. When cells are stimulated, sodium ion channels open, and sodium diffuses from the outside of the cell to the inside of the cell. Sodium ion concentrations in a resting cell are an example of , and sodium ion movement in a stimulated cell is an example of .
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In most resting cells, the concentration of sodium ions is higher outside of cells compared with the...
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