What is the function of a lymph node?

The function of a lymph node is to filter lymph and support immune functions. Lymph nodes are vital components of the lymphatic system and play a critical role in the body’s immune response. They contain lymphocytes, which are types of white blood cells essential for the immune system, helping to identify and respond to pathogens such as bacteria and viruses.

As lymph fluid circulates through the body, it collects waste products, toxins, and pathogens from the tissues. When this lymph fluid passes through lymph nodes, these filters work to trap and destroy these unwanted materials, which contributes to the overall immune defense mechanism. Additionally, lymph nodes can produce lymphocytes, thereby enhancing their ability to fight infections.

The other choices do not accurately reflect the primary responsibility of lymph nodes. For example, producing red blood cells is a function of the bone marrow, not lymph nodes. Similarly, the storage of fatty acids takes place in fat cells, while the circulation of blood is primarily the function of the cardiovascular system, specifically the heart and blood vessels.