Which of the following is a cell in the body that is capable of differentiating to a plasma cell and secreting antibody:

Correct Answer: A

Rationale: B cells differentiate into plasma cells to secrete antibodies; mast cells , NK cells , neutrophils , and platelets do not.

Correct Answer: B

Rationale: Overlapping endothelial cells allow greater permeability in lymphatic capillaries; they have thinner walls , looser junctions , and no smooth muscle .

Correct Answer: A

Rationale: It lacks a central pump like the heart; it has vessels , capillaries , and valves .

Correct Answer: B

Rationale: Macrophages in red pulp phagocytose RBCs; lymphocytes , T , and B cells are in white pulp.

Correct Answer: C

Rationale: Trunks drain lymph into ducts; filtering is nodes, collecting is capillaries, producing is marrow.