What are The structure that a part of the immune system represented by?

Lymph nodes

Lymph nodes are small, bean-shaped organs that are part of the lymphatic system. They are located throughout the body, but are especially concentrated in the neck, armpits, and groin. Lymph nodes filter lymph fluid, which is a clear fluid that contains white blood cells. White blood cells help to fight infection.

Lymph nodes also contain immune cells called lymphocytes. Lymphocytes are able to recognize and attack foreign invaders, such as bacteria and viruses. When a foreign invader is detected, the lymph nodes swell and become tender. This is a sign that the immune system is working to fight infection.

Lymph nodes are an important part of the immune system. They help to protect the body from infection by filtering lymph fluid and attacking foreign invaders.