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Name several cytokines and describe their role in the immune response.
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21. The Immune System
Antigens
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Which of the following is true of antigens?
A
Antigens are a type of white blood cell.
B
Antigens are always harmful to the body.
C
Antigens are produced by the immune system to fight infections.
D
Antigens are substances that can trigger an immune response.
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Begin by understanding the definition of antigens. Antigens are substances that can trigger an immune response in the body.
Recognize that antigens are not a type of white blood cell. White blood cells are part of the immune system that respond to antigens.
Understand that antigens are not always harmful. They can be foreign substances like bacteria or viruses, but they can also be harmless substances like pollen.
Clarify that antigens are not produced by the immune system. Instead, they are recognized by the immune system, which then produces antibodies to fight them.
Conclude that the correct statement is: Antigens are substances that can trigger an immune response.
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