ATI RN
Chapter 20 The Lymphatic System and Immunity Sample Questions Questions
Question 1 of 5
Choose the correct statement about splenic trabeculae:
Correct Answer: A
Rationale: Splenic trabeculae are made of connective tissue cells and fibers ; they have elastic fibers and muscle , extend from capsule , and form irregular compartments .
Question 2 of 5
What happens when killer T cells recognize foreign MHC molecules in organ transplants?
Correct Answer: A
Rationale: Killer T cells attack foreign MHC in transplants , causing rejection; they don't ignore , produce antibodies , or activate DCs here.
Question 3 of 5
Which cell has the shortest lifespan?
Correct Answer: D
Rationale: Neutrophils have the shortest lifespan (hours, D); plasma B cells (A, B) and DCs live longer.
Question 4 of 5
What traits characterize antigens?
Correct Answer: A
Rationale: Antigens are diverse molecules (proteins, polysaccharides, etc.) triggering immunity ; not only microbial , not antibodies , not just proteins .
Question 5 of 5
The pattern recognition receptors on cells of the innate immune system are genetically encoded, meaning that their sequences and specificities are determined prior to the development of the individual. In contrast, the antigen receptors of B and T lymphocytes arise from a random rearrangement process that occurs differently in each lymphocyte as it develops. One potential problem entailed by the random process that generates lymphocyte antigen receptors is the possibility that:
Correct Answer: D
Rationale: Random rearrangement risks non-functional receptors ; self-recognition is managed by tolerance, non-specificity or graft rejection are secondary.