ATI RN
Immune System Questions Questions
Question 1 of 5
Which of the following helps activate our nonspecific (innate) defense system?
Correct Answer: B
Rationale: Inflammation is a key innate defense mechanism, activating nonspecific responses to injury or infection, unlike active/passive immunity (adaptive) or erythrocyte mobilization.
Question 2 of 5
Which complement pathway becomes activated by spontaneous hydrolysis of C3?
Correct Answer: B
Rationale: The alternative pathway is triggered by spontaneous C3 hydrolysis on pathogen surfaces, unlike classical (antibody-driven) or lectin (sugar-binding) pathways.
Question 3 of 5
Which of the following statements correctly describes the exogenous pathway of antigen processing?
Correct Answer: A
Rationale: The exogenous pathway processes extracellular antigens for MHCII, activating CD4+ T cells, not cytosolic (endogenous) or TAP/proteasome-dependent.
Question 4 of 5
T cells that have a β T cell receptors:
Correct Answer: B
Rationale: αβ T cells (95% of T cells) express CD4 or CD8, require MHC, and drive adaptive immunity.
Question 5 of 5
Which DOES NOT provide long-term immunity?
Correct Answer: B
Rationale: Passive immunity is short-term, relying on transferred antibodies; active immunity (A, C) generates long-term memory.