ATI RN
Immune System Quiz Questions Questions
Question 1 of 5
Identify the following organ & choose the correct statement:
Correct Answer: D
Rationale: Context suggests thymus (CD4+ and CD3+ T-cell production, D); spleen degrades RBCs , lymph nodes have vessels , tonsils produce antibodies .
Question 2 of 5
What is the role of co-stimulation molecules in APCs?
Correct Answer: C
Rationale: Co-stimulatory molecules (e.g., B7) bind CD28 on T cells for activation ; pattern recognition , DC activation , and killing are distinct.
Question 3 of 5
What is the function of CTLA-4 on T cells?
Correct Answer: B
Rationale: CTLA-4 inhibits T-cell activation by competing with CD28 ; it doesn't activate (A, C) or target B7 directly .
Question 4 of 5
Why do tissues swell during inflammation?
Correct Answer: C
Rationale: Increased capillary permeability during inflammation allows fluid leakage, causing swelling ; bacteria , blood cells , and pus contribute but aren't the primary cause.
Question 5 of 5
The antigen receptor on a T cell recognizes a degraded fragment of a protein (i.e., a peptide) bound to a specialized cell surface peptide-binding receptor called an MHC molecule. One key aspect of this system is that the peptides displayed on MHC molecules can be derived from intracellular proteins. This mode of antigen recognition is particularly important in allowing the adaptive immune response to detect infections by:
Correct Answer: B
Rationale: MHC presentation of intracellular peptides detects viruses/protozoa ; extracellular pathogens (C, D) or helminths are less MHC-dependent.