A substance formed by the body in reaction to a perceived foreign substance is a(n):
A) antibody.
B) antigen.
C) cytokine.
D) lymphokine.

Question

Quizplus · Accepted Answer

Antibodies are proteins produced by the body's immune system in response to a foreign substance, such as a virus or bacteria. Antibodies act to neutralize or destroy the foreign substance. Antigens are the foreign substances that stimulate the production of antibodies. Cytokines and lymphokines are cellular signaling molecules involved in the immune response.

A Substance Formed by the Body in Reaction to a Perceived