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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.
Â· just now. Report Abuse. Bone marrow contains hematopoietic stem cells which differentiate into white blood cells. As you may already know, white blood cells are the cells of the immune system as they protect the body against disease/foreign substance.Sean Â· 7 years ago.Thumbs up. just now. Report Abuse. Bone marrow contains hematopoietic stem cells which differentiate into white blood cells. As you may already know, white blood cells are the cells of the immune system as they protect the body against disease/foreign substance.