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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.
If the bone marrow is not taken care of and is unable to produce the adequate amount of blood cells for the body, then the rest of the immune system will take a hit since it is the white blood cells and lymphocytes that provide the backbone of our immune system.t mainly contains numerous cells that are essential to supporting your immune system. These cells are white blood cells whose main purpose is to act as the defenders of your body against any possible bacteria or pathogen that might harm it. In these white blood cells you can find lymphocytes and macrophages.