ATI RN
Chapter 20 The Lymphatic System and Immunity Sample Questions Questions
Question 1 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 2 of 5
Many of the inflammatory mediators produced by tissue macrophages at sites of infection act on the endothelial cells lining the blood vessel walls. An exception to this is (are) the:
Correct Answer: D
Rationale: Bradykinin causes pain, not endothelial effects; cytokines (A, C), chemokines , and TNF target endothelium.
Question 3 of 5
IgM is the first antibody isotype secreted following activation of a naive B cell. IgM is found at high concentrations in the serum, and is found as a very high molecular weight complex. This high molecular weight complex is composed of:
Correct Answer: D
Rationale: IgM forms a pentamer for high avidity; not mixed isotypes , non-Ig proteins , or complement .
Question 4 of 5
Peripheral nervous system (PNS)
Correct Answer: D
Rationale: The PNS is outside the CNS (brain and spinal cord) and includes nerves and ganglia, making A and B correct.
Question 5 of 5
Which of the following statements about the humoral immune response is true?
Correct Answer: B
Rationale: Humoral immunity, via B cells and antibodies, targets pathogens in fluids (e.g., blood, lymph), not T cell activation, cancer, or macrophage antibody production.