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Making the world better, one answer at a time. bone marrow is considered to part of the immune system because it was the key component of the lymphatic system, producing the lymphocytes that support the body's immune system.aking the world better, one answer at a time. bone marrow is considered to part of the immune system because it was the key component of the lymphatic system, producing the lymphocytes that support the body's immune system.
Collectively, the cells of the immune system are known as white blood cells. These cells originate from the lymphatic system organs, which include the tonsils, lymph nodes and bone marrow. As far as scientists have determined, each cell plays a specific role in fighting disease.