Blood cells are made in the bone marrow. The bone marrow is the soft, spongy material
in the center of the
produces about 95% of the body's blood cells. Most of the adult body's bone marrow is in
the pelvic bones, breast bone, and the bones of the spine.
are other organs and systems in our bodies that help regulate blood cells. The lymph
nodes, spleen, and liver help regulate the production, destruction, and differentiation
(developing a specific function) of cells.
Blood cells formed in the bone marrow start out as a stem cell.
A stem cell
phase of all blood cells. As the stem cell matures, several distinct cells
red blood cells, white blood cells, and platelets. Immature blood cells are also called
blasts. Some blasts stay in the marrow to
travel to other parts of the body to develop into mature, functioning blood cells.