A protein substance that is produced in the body in response to an invading foreign substance is called a/an:
A) antigen.
B) phagocyte.
C) platelet.
D) antibody.

Question

Quizplus · Accepted Answer

Antibodies are proteins produced by the body in response to the presence of antigens (foreign substances) such as bacteria or viruses. Antibodies help to identify and neutralize these foreign substances by binding to them and targeting them for destruction by other components of the immune system.

A Protein Substance That Is Produced in the Body in Response