ATI RN
Lymphatic System and Immunity Test Questions Questions
Question 1 of 5
Which of the following immune cells/molecules are most effective at destroying intracellular pathogens?
Correct Answer: B
Rationale: T cytolytic cells kill intracellular pathogens; helpers assist, antibodies target extracellular.
Question 2 of 5
Natural killer cells assess whether other cells are abnormal by detecting types and levels of surface-associated
Correct Answer: A
Rationale: MHC class I molecules are self-identification molecules found on all nucleated host cells. Natural killer cells, after making contact with cells expressing stress signals, make the decision whether to kill them or not by assessing whether they express the appropriate types and levels of MHC I molecules. Although they are members of the innate immune system, natural killer cells do not recognize nonself, pathogen-associated molecular patterns, or pattern recognition receptors. Natural killer cells are unable to recognize somatically generated cell surface receptors.
Question 3 of 5
Which of the following is the major immunoglobulin in human serum, accounting for 80% of the immunoglobulin pool?
Correct Answer: C
Rationale: IgG is the most abundant immunoglobulin in serum (~80%), key for systemic immunity.
Question 4 of 5
Which of the following statements are correct?
Correct Answer: B
Rationale: Macrophages derive from monocytes and reside in tissues as phagocytic cells, not granulocytes.
Question 5 of 5
Helper T cells and inducer T cells are also called ___________ cells because of the coreceptor they both have.
Correct Answer: A
Rationale: Helper and inducer T cells are CD4+ ; CD8+ are cytotoxic.