Which structure filters lymph and produces new lymphocytes and antibodies?

• A. Spleen
• B. Lymph Nodes
• C. Thymus
• D. Lymphatic Capillaries

Answer: (B)

Lymph nodes are the places where lymph is checked and immune responses are organized. As lymph travels through a node, macrophages and dendritic cells filter out pathogens and present their antigens to B and T cells. This triggers the proliferation of lymphocytes, especially B cells into plasma cells that produce antibodies, and activates T cells for targeted responses. The spleen filters blood, not lymph, and the thymus is where T cells mature rather than filtering lymph. Lymphatic capillaries merely collect lymph and do not filter or produce antibodies. So the structure that best fits both filtering lymph and producing new lymphocytes and antibodies is the lymph node.