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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.
A. Bone marrow: The site in the body where most of the cells of the immune system are produced as immature or stem cells. B. Stem cells: These cells have the potential to differentiate and mature into the different cells of the immune system.