ATI RN
Questions on the Immune System Questions
Question 1 of 5
What is the function of MHC I molecules?
Correct Answer: C
Rationale: MHC I presents endogenous (intracellular) peptides to CD8+ killer T cells ; exogenous peptides and Th cells are MHC II roles.
Question 2 of 5
What is the function of Th17 cells in the intestinal immune defense?
Correct Answer: C
Rationale: Th17 cells recruit neutrophils and boost mucus via IL-17 ; IL-10/TGF-β is Treg, IFN-γ/IgG is Th1, TJ/IgA is partial."To suppress the activation of potentially self-reactive T cells
Question 3 of 5
Which of these is not a non-specific defense mechanism?
Correct Answer: C
Rationale: Antibodies are specific defenses; bacteria aren't defenses, stomach pH and sebaceous glands are nonspecific.
Question 4 of 5
Women with urinary tract infections caused by E. coli are generally treated with a course of antibiotics. A common complication of the antibiotic treatment is the occurrence of a vaginal yeast infection caused by Candida albicans, an organism that is normally present in very low numbers in the human vaginal tract. This complication occurs because:
Correct Answer: D
Rationale: Antibiotics disrupt commensal bacteria, allowing Candida overgrowth ; epithelium damage , adhesion , or selective killing don't explain this.
Question 5 of 5
The innate immune response together with antibodies are generally not effective at clearing infections established by pathogens that replicate inside host cells. The evolution of T cells has provided a means for the immune response to 'see' intracellular infections based on the ability of T cells to:
Correct Answer: D
Rationale: T cells detect intracellular pathogens via MHC-peptide complexes ; cytokines , interferon , or inflammation are indirect.