The immune response is terminated or decreased by

Correct Answer: B

Rationale: Suppressor (regulatory) T cells dampen responses; no suppressor B cells , and termination occurs .

Correct Answer: D

Rationale: Lymph is primarily interstitial fluid that has entered lymphatic vessels, similar in composition but with fewer proteins than blood or serum.

Correct Answer: A

Rationale: The alternative complement pathway is nonspecific, unlike IgE binding or specific B-cell responses.

Correct Answer: C

Rationale: B cells activate and differentiate in lymph nodes, producing plasma cells.

Correct Answer: B

Rationale: The spleen filters blood and mounts immune responses.