ATI RN
Questions on the Immune System Questions
Question 1 of 5
in thoracic Cavity behind sternum:
Correct Answer: B
Rationale: Thymus is located in the thoracic cavity behind the sternum.
Question 2 of 5
What happens to CD4-CD8 double-positive cells in the thymus when they do not recognize MHC molecules?
Correct Answer: D
Rationale: Double-positive thymocytes that fail to recognize MHC undergo apoptosis during negative selection; they don't proliferate or differentiate (B, C) without MHC interaction.
Question 3 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 4 of 5
What are the two pieces of information required for a Th cell to make a decision about which cytokines to produce?
Correct Answer: A
Rationale: Th cells decide cytokines based on invader type and location ; virulence , duration , and damage are less specific.
Question 5 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