It is an important structure in the lymphatic system of the human body. Each lymph node is surrounded by a fibrous capsule and contains lymphatic tissue and lymphocytes, which are white blood cells responsible for fighting off infections.

The main function of lymph nodes is to filter lymph fluid, which carries waste products, toxins, and pathogens from the body tissues.

They also produce lymphocytes and antibodies that help in the immune response against infections. Immune Response:

When an infection or injury occurs, lymph nodes become enlarged and tender due to an increase in lymphocytes and immune cells.

The lymph nodes closest to the affected area will often swell, giving a clue to the location of the problem. This response is known as lymphadenopathy and is a common symptom of many diseases.

As lymph nodes play a crucial role in filtering and fighting off infections, they can be affected by various diseases and disorders.