Which cells are key to type III hypersensitivity?

Correct Answer: B

Rationale: B cells produce immune complexes for type III; T cells are type IV, mast cells are type I, neutrophils respond.

Correct Answer: C

Rationale: Lymphatic capillaries resemble blood capillaries due to their endothelial lining, which allows fluid exchange, though their permeability and roles differ.

Correct Answer: A

Rationale: Trabecular sinus separates lymphatic nodules from trabeculae in lymph nodes.

Correct Answer: D

Rationale: Trabecular arteries divide into follicular arterioles in white pulp.

Correct Answer: C

Rationale: Thymosin stimulates general lymphocyte production.