ATI RN
Immune System Questions Questions
Question 1 of 5
What characterizes natural killer (NK) cells?
Correct Answer: A
Rationale: NK cells are innate immune cells from a lymphoid progenitor; they're not adaptive (C, D) and not myeloid-derived .
Question 2 of 5
What is the role of CD40L in T cell activation?
Correct Answer: A
Rationale: CD40L (on Th cells) prolongs DC survival ; binding , proliferation , and TCR activation are indirect or separate.
Question 3 of 5
Which immune system cell is the most abundant in the lamina propria?
Correct Answer: B
Rationale: T cells are most abundant in the lamina propria for mucosal immunity; B cells , macrophages , and neutrophils are less dominant.
Question 4 of 5
Which lymphatic area is larger in a child than an adult?
Correct Answer: C
Rationale: The thymus is larger in children, shrinking with age; spleen , nodes , and duct don't vary as significantly.
Question 5 of 5
Antibodies, complement proteins, and phagocytic cells provide effective protection against all of the following types of infections in Figure Q2.1, except:
Correct Answer: C
Rationale: Assuming Q2.1 lists infection types, intracellular pathogens (e.g., viruses) resist antibodies/complement/phagocytosis ; extracellular pathogens are cleared.