A substance, usually found on the surface of foreign agents, that stimulates the body to mount an immune-system response to it is called a(n) ______.

Question

Quizplus · Accepted Answer

An antigen is a foreign substance, usually found on the surface of pathogens such as bacteria, viruses, and parasites, that triggers an immune response from the body. This immune response produces antibodies, which are proteins that recognize and neutralize the antigen. Pathogens are the actual infectious agents, while platelets are a type of blood cell involved in clotting and wound healing.

A Substance, Usually Found on the Surface of Foreign Agents