Bone Marrow is the soft, sponge-like tissue in the center of most bones. It produces white blood cells, red blood cells, and platelets. Bone marrow is a spongy substance found in the center of the bones. It manufactures bone marrow stem cells and other substances, which in turn produce blood cells. Each type of blood cell made by the bone marrow has an important job.
Red blood cells carry oxygen to tissues in the body. Platelets stop bleeding by helping blood clot. White blood cells fight infections.
Three very important types of white blood cells are essential to the proper functioning of the body's immune system, which fights infection:
Neutrophils and Macrophages — These white blood cells fight bacterial and fungal infections by "eating" germs Lymphocytes — These white blood cells fight bacterial, viral and fungal infections. T lymphocytes, also called T cells, attack viruses and other germs. T cells from the donor also can attack the recipient resulting in a reaction called graft versus host disease. T cells from the recipient can reject the donor bone marrow cell resulting in graft failure. B lymphocytes make antibodies which help destroy germs in our body.