in the bone marrow through the highly regulated process of hematopoiesis.
Blood cells develop from hematopoietic stem cells and are formed in the bone marrow through the highly regulated process of hematopoiesis. Hematopoietic stem cells are capable of transforming into red blood cells, white blood cells, and platelets. White blood cells or leukocytes are formed in the bone marrow (within the bones). Amongst other things, they are primarily responsible for controlling infections in the body. When the bodies white blood cell counts drop for some reason (cancer, chemotherapy etc), the ability to fight infection is compromised. White blood cells are produced by bone marrow within bone. Some white blood cells mature in the lymph nodes, spleen, or thymus gland. The life span of mature leukocytes ranges from about a few hours to several days. Blood cells are made in the bone marrow. Erythrocytes, or red blood cells, are constantly being produced and released from marrow tissue. Leukocytes, or white blood cells are also produced in the bone marrow. B cells and T cells are leukocytes that are made and mature in the bone marrow while T cells mature in Thymus. Red blood cells, most white blood cells, and platelets are produced in the bone marrow, the soft fatty tissue inside bone cavities. Two types of white blood cells, T and B cells (lymphocytes), are also produced in the lymph nodes and spleen, and T cells are produced and mature in the thymus gland. White blood cells or leukocytes are cells of the immune system that defend the body from disease-causing germs, bacteria, and viruses. They are called white blood cell simply … because they're white. They are produced in the bone marrow and live between 3 and 4 days. White blood cells are produced inside the bone marrow and stored in your blood and lymphatic tissues. Because some white blood cells have a short lifespan of one to three days, your bone marrow is constantly producing them. Click to Enlarge.
http://www.hematology.org/Patients/Basics/ http://www.answers.com/Q/Where_are_white_blood_cells_formed http://biology.about.com/od/cellbiology/ss/white-blood-cell.htm http://www.answers.com/Q/Where_are_blood_cells_made http://www.merckmanuals.com/home/blood-disorders/biology-of-blood/formation-of-blood-cells http://www.answers.com/Q/Where_are_white_blood_cells_formed http://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=160&ContentID=35
where are white blood cells formed