ATI RN
Pediatric Immunization NCLEX Questions Ricci Questions
Question 1 of 5
CD4 in secondary lymphoid organs that has not been exposed to its antigen yet is called?
Correct Answer: C
Rationale: Naïve mature T helper cells (CD4+) reside in secondary lymphoid organs before antigen exposure, distinguishing them from activated or cytotoxic cells.
Question 2 of 5
Which of the following doesn't Express MHC II
Correct Answer: A
Rationale: Neutrophils do not express MHC class II, unlike professional APCs (macrophages, B cells, dendritic cells) or activated endothelial cells.
Question 3 of 5
Which immune cell is responsible for the quickest release of histamine that causes the red itchy welts associated with allergies?
Correct Answer: A
Rationale: Mast cells rapidly release histamine in allergic responses, causing welts.
Question 4 of 5
Cytokines
Correct Answer: B
Rationale: Cytokines can be inhibited by soluble receptor fragments, blocking their activity.
Question 5 of 5
In the classical pathway, after the proteolysis of C3 complement pathway, which component is cleaved by C4bC2aC3b and initiate the formation of membrane attack complex
Correct Answer: A
Rationale: C5 is cleaved by C5 convertase (C4b2a3b) to initiate MAC formation.