ATI RN
Immune System Multiple Choice Questions and Answers PDF Questions
Question 1 of 5
Which of the following is NOT a physical barrier that prevents infection?
Correct Answer: C
Rationale: HCl is a chemical barrier, not physical like skin or cilia.
Question 2 of 5
How are antibody producing cells stimulated?
Correct Answer: B
Rationale: B cells (antibody producers) are stimulated by helper T cells via MHC-II.
Question 3 of 5
Examples of primary mediators released by Mast cells would be
Correct Answer: D
Rationale: Heparin is a preformed primary mediator; cytokines , leukotrienes , and PAF are secondary.
Question 4 of 5
The sum of the attractive and repulsive forces of all antibodies binding to an antigen is:
Correct Answer: A
Rationale: Affinity is binding strength; avidity is total strength, cross-reactivity is nonspecific binding, and non-reactivity is lack of binding.
Question 5 of 5
Lymphocytes that are CD4+CD25+FoxP3+ with respect to cell surface markers are called:
Correct Answer: D
Rationale: T regulatory cells are CD4+CD25+FoxP3+; not APCs , B cells , cytotoxic , or NK-like .