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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 bone marrow is a soft tissue that is inside some of the larger bones. It contains stem cells which develop into the three different types of blood cell: red blood cells white blood cells, and platelets.We can think of the bone marrow as a nursery for all blood cells.Since normal cells are present in the marrow, it's not unusual or unexpected that lymphoma cells will also present in this organ. The involvement in the marrow is determined and measured by a biopsy-a sample of the cells in the region.e can think of the bone marrow as a nursery for all blood cells. Since normal cells are present in the marrow, it's not unusual or unexpected that lymphoma cells will also present in this organ. The involvement in the marrow is determined and measured by a biopsy-a sample of the cells in the region.