Final answer:
Lymph nodes are bean-shaped organs located along the lymphatic system that function as filters and play a crucial role in the immune system's defense against infections.
Step-by-step explanation:
Lymph nodes are small, bean-shaped organs located at certain intervals along the lymphatic system. They function as filters, removing debris and pathogens from the lymph, and are important sites for adaptive immune responses. Lymph nodes are composed of lymphatic tissue and have a tough capsule of connective tissue that provides structural support. They play a crucial role in the immune system's defense against infections.