Under certain circumstances, potassium ions ( k+ ) in a cell will move across the cell membrane from the inside to the outside. the potential inside the cell is −75.5 mv and the potential outside the cell is zero. what is the change in the electrical potential energy of a single potassium ion as it moves across the membrane?

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.