What is the function of the lymphatic system in the immune response?

• A. It transports white blood cells, filters pathogens through lymph nodes, and facilitates immune cell activation.
• B. It only stores red blood cells.
• C. It digests pathogens directly.
• D. It produces antibodies in bone marrow only.

Answer: (A)

The lymphatic system mainly supports immune defense by moving white blood cells through the body, filtering lymph through lymph nodes where pathogens are trapped, and presenting them to immune cells to trigger activation. This orchestration helps initiate and amplify B and T cell responses, guiding targeted attack on pathogens and the development of immune memory. That’s why describing transport of immune cells, pathogen filtration in lymph nodes, and immune activation captures its essential role.

Other options don’t fit because storing red blood cells is not a function of the lymphatic system (that's more about the spleen and circulation), it doesn’t digest pathogens directly (digestion is done by immune cells after recognizing invaders), and antibody production isn’t confined to bone marrow only—plasma cells that secrete antibodies arise from activated B cells in bone marrow and lymphoid tissues, not exclusively in the bone marrow.