What enzyme is responsible for dissolving the blood clot after regeneration of the vessel wall is complete?

Plasmin

Explanation:

Plasmin is a serine protease also referred to as fibrin digesting enzyme, it is responsible for the dissolving or degradation of blood clot. The process by which plasmin degrades blood clot is called fibrinolysis. Note that plasmin (active) is formed from an inactive enzyme called plasminogen.