The cells of the immune system secrete substances that mediate the immune response that are called:
1. antigens.
2. masts.
3. cytokines.
4. antibodies.
Correct Answer: 3
Rationale 1: Antigens form in response to antibodies.
Rationale 2: Mast cells are a part of the inflammatory response.
Rationale 3: The cells of the immune system secrete cytokines.
Rationale 4: Antibodies are substances that attack antigens. They are not secreted by the immune system.
Global Rationale: When challenged by antigens, certain cells of the immune system secrete cytokines, which are substances that help the body mediate and intensify the immune response. Because cytokines have powerful actions on the immune system, the body generally only produces them when challenged by an antigen; their production is rapid though transient. Antigens form in response to antibodies. Mast cells are a part of the inflammatory response. Antibodies are substances that attack antigens. They are not secreted by the immune system.
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