ATI RN
Lymphatic System Test Questions Questions
Question 1 of 5
Vaccination against many infectious diseases has provided enormous benefit in developed countries, leading to the virtual eradication of diseases such as polio, measles, smallpox, and others. However, efforts to create long-lasting vaccines against some viral infections, like Influenza and HIV, have not been successful to date because:
Correct Answer: A
Rationale: Antigenic variation allows Influenza/HIV to evade immunity; speed , RNA , or mucosa are challenges but not primary.
Question 2 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 3 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 4 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.
Question 5 of 5
Which of the following statements is specific to gut chemical barriers?
Correct Answer: A
Rationale: Pepsin, a digestive enzyme in the stomach, acts as a gut-specific chemical barrier, unlike AMPs and lysozymes, which are broader innate defenses.