In course of an experiment there has been an increase in the nerve conduction velocity. This may be caused by an increase in the concentration of the following ions that are present in the solution around the cell:

Answer options

1. K and Cl-
2. Ca2
3. K and Na
4. Na
5. Ca2 and Cl

Explanation

Sodium ions cause depolarization of cells, since there is an increase in nerve conduction, it can only mean that there’s an increase of Sodium ions around the cell.