ATI RN
Lymphatic and Immune System Test Questions Questions
Question 1 of 5
Secondary (or peripheral) lymphoid organs are sites for initiation of adaptive immune responses. Given the rarity of lymphocytes specific for any given antigen and the vast amount of body tissue that must be protected, the system of secondary lymphoid tissues is efficient because:
Correct Answer: A
Rationale: Secondary lymphoid organs concentrate antigens for rare lymphocytes; proliferation follows, trapping or innate clearance are less primary.
Question 2 of 5
In spite of their low affinity for binding to their antigen, IgM antibodies can be quite effective at promoting the elimination of extracellular bacterial infections. This is due to:
Correct Answer: B
Rationale: IgM pentamers bind multivalently , enhancing efficacy; not epithelial , concentration , or timing alone.
Question 3 of 5
Neurons are
Correct Answer: D
Rationale: Neurons are signal-carrying cells, the functional units of the nervous system, and consist of a cell body, dendrites, and axons. All options are correct.
Question 4 of 5
Which of the following cell types is responsible for the cell-mediated immune response?
Correct Answer: A
Rationale: T cells drive cell-mediated immunity, targeting infected or cancerous cells, unlike B cells (humoral), leukocytes (general), or NK cells (innate).
Question 5 of 5
Which of the following diseases is thought to be an autoimmune disease?
Correct Answer: B
Rationale: Insulin-dependent diabetes (Type 1) is autoimmune, attacking pancreatic cells, unlike cancer, viral infections (measles/mumps), or ulcers.