Which organ in the lymphatic system acts as part of the body's defense against disease?

The lymph node plays a critical role in the body's defense mechanisms against disease. Lymph nodes are small, bean-shaped structures distributed throughout the lymphatic system and act as filters for harmful substances. They contain lymphocytes, which are white blood cells that help the body fight infections. When pathogens such as bacteria or viruses are detected in the lymphatic fluid, lymph nodes become activated and facilitate the immune response by producing more lymphocytes and other immune cells.

During an infection, lymph nodes may become swollen as they work to control the invasion by these pathogens. This response is a vital part of the adaptive immune system, ensuring that the body can effectively identify and respond to disease-causing agents. Thus, lymph nodes are integral to maintaining immune surveillance and protecting the body against diseases.

Other organs in the lymphatic system also contribute to immune function, but lymph nodes are specifically designed for filtering lymph and mounting an immune response, making them key players in disease defense.