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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 consists of hematopoietic cells and fat cells which help in producing new cells. It helps in production of the red blood cells and white blood cells and platelets. The function of these cells is to carry oxygen, help the body fight infections.