I searched for the answer for this question on Wikipedia and Stackexchange a lot but couldn't find same question or a required answer in some other similar question.
I understand that the function of the salt bridge is to complete the circuit and maintain electrical neutrality in both the half cells of a galvanic cell. This is achieved by movement of cations and anion in the salt bridge. the anions move towards anodic half cell and cations move towards cathodic half cell.
My question is- Are these cations and anions are provided by salt bridge itself and it depletes over time as the electrochemical reaction progresses?
Is salt bridge is just a medium and passing the anions from solution of cathodic cell to anodic cell and passing the cations from solution of anodic cell to cathodic cell?
Both of this happens?
I will be grateful for insight on this topic.