Which cells are involved in humoral immunity?

Correct Answer: B

Rationale: B cells drive humoral immunity via antibodies; T cells are cellular, macrophages and dendritic are innate.

Correct Answer: C

Rationale: Peyer's patches trap gut pathogens; spleen filters blood, thymus matures T cells, nodes filter lymph.

Correct Answer: B

Rationale: Memory lymphocytes provide immune memory; neutrophils , macrophages , and eosinophils are innate.

Correct Answer: A

Rationale: Hassall's corpuscles are a distinctive feature of the thymic medulla.

Correct Answer: B

Rationale: Small to medium lymphatic vessels have thin walls to facilitate lymph flow, but diameter and lumen size vary, so not all apply.