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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 is the soft, spongy, gelatinous tissue found in the hollow spaces in the interior of bones.The average weight of this tissue is about 4% of the total body weight, or 2.6 kg in an adult weighing 65 kg. Progenitor cell (stem cell) lines in the bone marrow produce new blood cells and stromal cells. Bone marrow is also an important part of the lymphatic system. Bone marrow consists of stem cells, which are large, primitive, undifferentiated cells supported by fibrous tissue called stroma.