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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.
The cells that contribute to the immune system are mostly derived from the bone marrow. Bone marrow is the soft material in the centre of large bones. It acts like a factory where âstemâ cells produce an ongoing supply of blood cells: red blood cells to carry oxygen. platelets to repair leaky blood vessels and.