ATI RN
Ricci Maternity and Pediatrics NCLEX Question Immunization Questions
Question 1 of 5
A 36-year-old woman with severe allergy to yellow jackets was stung multiple times at a soccer game. Within minutes she developed respiratory distress and became unconscious. Which mediator is primarily responsible for this reaction?
Correct Answer: C
Rationale: Histamine, released by mast cells in anaphylaxis, causes rapid respiratory distress and hypotension.
Question 2 of 5
The membrane attack complex consists of five different complement proteins C5, C6, C7, C8, and C9. Which of the following subunits bind to the surface and provide a binding site for a subsequent component?
Correct Answer: B
Rationale: C5b binds to the target membrane, initiating MAC assembly with C6-C9.
Question 3 of 5
Neutrophils are attracted to the sites of extracellular bacterial infections by which two important chemotactic substances?
Correct Answer: B
Rationale: C5a and IL-8 (CXCL8) are potent neutrophil chemoattractants during bacterial infections.
Question 4 of 5
A cell expressing CD3pos, CD25 pos, is a:
Correct Answer: D
Rationale: CD3+CD25+ cells are typically regulatory T cells (Tregs), expressing FoxP3.
Question 5 of 5
Which of the following describes the hematopoietic centers in Gestation?
Correct Answer: A
Rationale: Hematopoiesis shifts from blood islands (yolk sac) to liver, then bone marrow during gestation.