Question

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.

Answer 1

The answer is; 3

An emf is the ‘pressure’ created by the potential difference in electrical energy across an area. The proton pumps in the axon of the neurons pump out Na+ ions to the outside of the cell. This leaves the inside of the neurons electronegative in comparison to the inside. During depolarization, the Na + rush into the cell.