Final answer:
Lymphatic nodules function to defend against infections in a specific area of the body by filtering pathogens from the lymph and mounting immune responses.
Step-by-step explanation:
Lymphatic nodules have several functions, including defending against infections in a specific area of the body. These nodules contain cells such as dendritic cells and macrophages that help remove pathogens from the lymph, acting as filters. They also play a role in the adaptive immune system and host defense by mounting immune responses with the help of T cells and B cells. In addition to defense, lymphatic nodules do not produce lymph or pass lymph to lymphatic trunks.