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If sodium ions are outside the cell, they will tend to move into the cell based on either their concentration gradient and voltage across the membrane.
A substance is found in different concentrations in a region of space or on opposite sides of a membrane. However, because of the ability of atoms and molecules to form ions and carry positive or negative electrical charges, there can also be an electrical gradient, or differences in charge, across a plasma membrane.
With this information, we can conclude that if sodium ions are outside the cell, they will tend to move into the cell based on their concentration and voltage gradient across the membrane.
Learn more about Electrochemical gradients in brainly.com/question/17136000