White pulp of spleen: Is distinguished by the presence of the 'central artery'.

Correct Answer: A

Rationale: The central artery is a defining feature of white pulp, surrounded by lymphoid tissue.

Correct Answer: D

Rationale: Paracortex is rich in T-lymphocytes; primary/secondary follicles and medullary cords contain B-lymphocytes.

Correct Answer: C

Rationale: Blood sinusoids collect blood into venous sinuses in red pulp.

Correct Answer: D

Rationale: Macrophages phagocytose debris , destroy erythrocytes , and contribute to iron metabolism (part of B); all apply.

Correct Answer: A

Rationale: Mononuclear phagocytes (macrophages) have irregular surfaces with pseudopodia for phagocytosis ; Golgi and sER are present but not defining , peroxisomes are not notable , nuclei vary .