ATI RN
Chapter 20 The Lymphatic System and Immunity Sample Questions Questions
Question 1 of 5
Peripheral tolerance is maintained by all of the following mechanisms except
Correct Answer: B
Rationale: Thymus deletion is central, not peripheral; anergy , clonal deletion , and Tregs are peripheral.
Question 2 of 5
In the above question, resolution of parasitic infections of the gastrointestinal tract is dependent upon the activation of:
Correct Answer: D
Rationale: Th2 cells drive IgE via IL-4/IL-13 for parasites; Th1 is antiviral, not IgG or cytotoxic .
Question 3 of 5
Which lymphoid organ shrinks significantly after puberty?
Correct Answer: B
Rationale: The thymus shrinks post-puberty; spleen , lymph nodes , and tonsils maintain size.
Question 4 of 5
Which lymphoid tissue is most active in early childhood?
Correct Answer: B
Rationale: The thymus is most active in childhood for T cell maturation; others (A, C, D) remain active throughout life.
Question 5 of 5
What is the role of the spleen's red pulp macrophages?
Correct Answer: C
Rationale: Red pulp macrophages remove old RBCs; antibodies are B cells, lymph is nodes, lymphocytes are white pulp.