Which term describes the introduction of embalming fluid directly into the vascular system?

The term that accurately describes the introduction of embalming fluid directly into the vascular system is injection. In the context of embalming, the process involves using a mechanical pump to introduce the embalming fluid through the arterial system, allowing it to circulate throughout the body. This method ensures that the tissues are treated with the preservative chemicals, providing the necessary preservation and sanitation for the deceased.

Infusion generally refers to the introduction of a substance directly into a body cavity or tissue, rather than specifically into the vascular system. Transfusion is a medical procedure typically used for transferring blood or blood components from one person to another, which is not applicable in the context of embalming. Extraction involves the removal of fluids or tissues, contrary to the concept of introducing a solution into the body. Thus, injection is the most precise term in this scenario, highlighting the method of delivery of embalming fluid into the bloodstream.