What is the immune System
The immune system: Works to keep germs out of the body and destroy any that get in.
Is made up of a complex network of cells and organs that protect the body from infection, which include:
Lymph nodes are part of the immune system.
They release lymphocytes, a certain type of white blood cell that fights infection.
The blood vessels and lymph vessels carry the lymphocytes to and from different areas in the body.
Each lymphoid organ plays a role in the production and activation of lymphocytes.
Organs in the lymph system include:
Adenoids: Two glands at the back of the nasal passage.
Blood vessels: The arteries, veins, and capillaries through which blood flows.
Bone marrow: The soft, fatty tissue found inside bones where blood cells are made.
Lymph nodes: Small organs shaped like beans, which are located all over the body and connect via the lymphatic vessels.
Lymph vessels: A network of channels all over the body that carry lymphocytes to the lymphoid organs and bloodstream.
Peyer’s patches: Lymphoid tissue in the small intestine.
Spleen: A fist-sized organ in the left side of the belly.
Thymus: A small organ behind the breastbone.
Tonsils: Two oval masses in the back of the throat