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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.
Among the organs that contribute to our immune response, there are two categories: primary lymphoid organs and secondary lymphoid organs. The bone marrow is one of two primary lymphoid organs, along with the thymus. Bone marrow is a sponge-like tissue found at the center of the body's large, flat bones.he bone marrow is one of two primary lymphoid organs, along with the thymus. Bone marrow is a sponge-like tissue found at the center of the body's large, flat bones.