ATI RN
Lymphatic System Test Questions Questions
Question 1 of 5
Which lymph nodes could not be palpated with the fingers?
Correct Answer: D
Rationale: Mesenteric nodes are deep in the abdomen, not palpable; axillary , inguinal , and cervical are superficial.
Question 2 of 5
NK cells can be activated following recognition of a virus-infected cell, if that cell has down-regulated expression of MHC class I proteins on its surface. However, NK cells can also recognize infected cells or tumor cells, even if they still express MHC class I proteins. In this latter case, activating receptors on NK cells are recognizing:
Correct Answer: A
Rationale: Stress molecules (e.g., MICA) activate NK cells ; cytokines , decoys , or mutations are less common triggers.
Question 3 of 5
The B cell co-receptor, composed of CD19/CD21/CD81, is a receptor that binds to complement fragments such as C3dg. When an antigen bound by the BCR on a B cell has also been tagged with C3dg, the B cell co-receptor is stimulated together with the BCR. Signaling through the co-receptor:
Correct Answer: C
Rationale: Co-receptor boosts BCR via PI 3-kinase ; not inhibition (A, B) or Src alone .
Question 4 of 5
Some complement proteins
Correct Answer: B
Rationale: Complement proteins enhance inflammation by attracting immune cells and promoting pathogen destruction, not inducing antibodies, NK cell activity, or replacing T cells.
Question 5 of 5
Antibody molecules may function by causing the
Correct Answer: B
Rationale: Antibodies agglutinate pathogens, clumping them for easier removal, not destroying complement, solubilizing, or crystallizing.