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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. The bone marrow gives rise to all of the cells engaged in the defense mechanisms of the body (with minor exceptions). In babies it is found in all the bones, but moving through puberty it is replaced in the long bones by fat so that in adults it is found only in the central bones, such as the ischium.The key cells in bone marrow are the hematopoietic stem cells, which give rise to the lymphoid stem cells and the myeloid stem cells.But we put off red blood cells until the spring.). 1  Lymphocytes. 2  Lymphocytes are the only cells capable of adaptively (specifically) making the molecules (antibodies and T cell receptors) that specifically recognize antigens, which are molecules foreign to the body.