The electrochemical gradient that determines how a charged ion will move through a permeable membrane depends upon the electrical forces acting on that ion the difference in concentration of that ion on either side of the membrane the ratio between the charge on the ion and its atomic mass athe combined effects of electrical forces and concentration differences across the membrane Allof the choices for this question are correct

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The combined effects of electrical forces and concentration differences across the membrane.

Since there are less positive ions within the cell due to the ion gradient, the interior is negative in comparison to the exterior forces. The ensuing membrane potential favors positively charged ions entering the cell and negatively charged ions exiting the cell. A combination of a concentration gradient and an electrical field gradient, the electrochemical gradient controls the direction in which ions will flow through an open ion channel. These two gradients may be taken into account individually. Energy can be released when the ions return down their electrochemical gradients, which primary active transport creates. The energy stored in these gradients is used in secondary active transport to move other materials against their own gradients.

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