What term describes fluids used to clear the vascular system of blood and facilitate the distribution of arterial solution?

Pre-injection fluids are specifically designed for the purpose of clearing the vascular system of blood and preparing it for the introduction of embalming fluid. These fluids typically contain substances that help to reduce blood clotting, promote fluid drainage, and enhance the distribution of the arterial solution throughout the body.

The pre-injection process is crucial in embalming, as it ensures that the arterial solution can circulate more effectively, which is vital for proper preservation. These fluids may include anticoagulants and other agents that assist in the fluid dynamics within the vascular system, making them essential in the embalming procedure.

Other terms listed in the question have different meanings: embalming fluids are the solutions used for preservation after pre-injection; drainage fluids would refer to fluids involved in the removal of blood from the vascular system, and coagulating agents are substances that promote blood clotting, which is contrary to the function of pre-injection fluids.