Where are lymph nodes located and what do they do?

Lymph nodes are specialized structures of the lymphatic system that are primarily located along lymph vessels throughout the body. Their main function is to filter lymph, a fluid that circulates through the lymphatic system, and to trap harmful cells such as bacteria, viruses, and cancerous cells. This filtering process allows lymph nodes to play a crucial role in the body's immune response. When harmful substances are detected, lymph nodes can initiate a response by activating lymphocytes, which are a type of white blood cell that can attack and help eliminate these threats. Their strategic positioning along the lymphatic pathways enables them to efficiently monitor and respond to potential infections and diseases throughout the body.