Bone Marrow

Bone marrow is the organ that produces blood cells. As opposed to solid organs like the heart and kidneys, bone marrow is spread rather diffusely throughout our bones. It is mainly concentrated in the skull, ribs, sternum, vertebrae and pelvic bone, and less so in other bones.

Bone marrow is the home for immature and young blood-producing cells. The cells grow and mature there and are subsequently released into the blood.