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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.
Bone marrow plays an important role in the immune system as it produces and releases the white blood cells.ome of these white blood cells will develop the properties of mature white blood cells in the thymus, an organ found in front of the heart, which will enable these cells to identify and attack infectious cells such as bacteria and viruses.