ATI RN
Immune System Multiple Choice Questions and Answers Questions
Question 1 of 5
Concerning the thymus, which of the following is correct?
Correct Answer: D
Rationale: Thymus cortex stains darker than medulla ; reticular cells are endodermal , barrier is in cortex , no afferent vessels or plasma cells .
Question 2 of 5
What is the role of HLA-DM protein in MHC II antigen presentation?
Correct Answer: A
Rationale: HLA-DM edits peptides for MHC II by releasing CLIP ; transport roles (B, D) and invariant chain guidance are distinct.
Question 3 of 5
What type of cells remain unbiased when they are first activated?
Correct Answer: D
Rationale: Th0 cells are uncommitted initially ; CTLs , Treg , and Th1 are specialized post-activation.
Question 4 of 5
The lymphatic trunk that drains the upper limb is the
Correct Answer: C
Rationale: The subclavian trunk drains the upper limb; bronchomediastinal drains the chest, intestinal the gut, and jugular the head/neck.
Question 5 of 5
The skin and bodily secretions provide the first line of defense against infection. One response in this category that is common during upper respiratory virus infections is:
Correct Answer: C
Rationale: Mucus production traps pathogens in the respiratory tract as a first-line defense; antibodies and WBC infiltration are later, saliva is less specific.