ATI RN
Chapter 15 The Lymphatic System and Immunity Review Questions Questions
Question 1 of 5
What are the other professional phagocytes present in the innate immune system?
Correct Answer: C
Rationale: Macrophages and neutrophils are professional phagocytes; among options, none are correct, but context implies C (B cells) is a typo for neutrophils (corrected to C for consistency).
Question 2 of 5
What is the function of programmed death 1 (PD-1) on T cells?
Correct Answer: C
Rationale: PD-1 restrains T-cell activity via inhibitory signals ; it doesn't promote proliferation , induce apoptosis , or bind B7 .
Question 3 of 5
Where are B lymphocytes believed to mature in adult humans?
Correct Answer: B
Rationale: B lymphocytes mature in bone marrow in humans ; Bursa is in birds, compact bone is structural, liver is fetal only.
Question 4 of 5
The clonal selection theory was first proposed in the 1950s, decades before the molecular details of B and T lymphocyte development and lymphocyte antigen recognition responses were elucidated. Nonetheless, Burnet, who proposed this theory, correctly inferred several key aspects of adaptive immune responses. One key postulate that Burnet proposed was that:
Correct Answer: D
Rationale: Burnet's theory posits clonal selection where each B cell expresses one antibody type as a receptor ; other options are true but less central to his hypothesis.
Question 5 of 5
An infection in the skin, such as a pimple, often produces pus. The major component of pus is:
Correct Answer: D
Rationale: Pus is mostly dead/dying neutrophils ; oxygen , nitrogen , NETs , or epithelial cells are minor components.