White blood cells are produced, stored, and transported by tissues and organs that fight infections and other disorders.
These organs are called lymphatic organs.
Lymphatic vessels, like blood vessels, branch out into all of the body's tissues.
Also known as the lymphatic system.
The bone marrow, spleen, thymus, lymph nodes, and lymphatic veins are all part of this system (a network of thin tubes that carry lymph and white blood cells).
The lymphatic system can be broadly classified into:
Primary lymphoid organs, which generate special immune system cells known as B or T lymphocytes. It has the following organs:
Bone marrow – sponge-like tissues situated within the bones
Thymus – found above the heart, behind the breastbone.
Secondary lymphoid organs – the cells of the immune system perform an action against foreign substances and germs. The organs included are
Spleen – found beneath the diaphragm in the left upper abdomen
Lymph nodes – acting like filters, tiny bean-shaped tissues seen along the lymphatic vessels
Tonsils – due to their location at the palate and throat, they can prevent germs from entering the body through the nose or mouth
Mucous Associated Lymphoid Tissue (MALT) - found in various submucosal membrane sites of the body, such as the gastrointestinal tract, oral passage, nasopharyngeal tract, thyroid, breast, lung, salivary glands, eye, and skin.
Peyer's patches of the small intestine - form a significant portion of the immune system by supervising the intestinal bacteria population and checking the growth of the pathogenic bacteria in the intestines.