ATI RN
Lymphatic System and Immunity Test Questions Questions
Question 1 of 5
Which of the following cytokines are mainly secreted by CD4 T helper 2 cells
Correct Answer: C
Rationale: Th2 cells secrete IL-4, IL-5, and IL-13, promoting humoral immunity and allergies, unlike Th1 (IL-2, TNF) or Th17 (IL-17) profiles.
Question 2 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 3 of 5
Plasma cells are formed by?
Correct Answer: B
Rationale: B lymphocytes differentiate into plasma cells; T cells don't.
Question 4 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 5 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.