Which of the following applies to the thoracic duct?

Correct Answer: B

Rationale: The thoracic duct drains lymph from most of the body (below the diaphragm and left upper body) and empties into the left subclavian vein, not blood into the system.

Correct Answer: A

Rationale: White pulp branches into penicillar arterioles in red pulp.

Correct Answer: D

Rationale: Thymulin enhances various T-cell functions.

Correct Answer: C

Rationale: Hassall's corpuscles increase with age ; they're in medulla , surrounded by reticular cells not lymphocytes , and are acidophilic .

Correct Answer: C

Rationale: Complement activates via classical (antibody-dependent), alternative (spontaneous), and lectin (mannose-binding) pathways ; other options misname pathways.