The spleen's red pulp removes:

Correct Answer: B

Rationale: Red pulp removes old RBCs; lymphocytes are white pulp, pathogens are macrophages, platelets are stored.

Correct Answer: A

Rationale: Epithelioreticular cells are key components of the thymic medulla, aiding T-cell development.

Correct Answer: C

Rationale: Tunica adventitia contains longitudinal smooth muscle and vasa vasorum in larger lymphatic vessels; stratum basale is epithelial.

Correct Answer: A

Rationale: Spleen trabeculae divide it into irregular compartments, not regular or cortex/medulla like lymph nodes.

Correct Answer: D

Rationale: Thymus stroma has a thin C.T. capsule , incomplete trabeculae , and reticular C.T. ; it does not have a thick capsule (D is incorrect).