Bone marrow blood cells - image description

This illustration shows the structure of a bone in cross-section, with the bone marrow in the middle. An arrow from the bone marrow points to a blood stem cell. From the stem cell three arrows point to the three different blood cells – a red blood cell, a platelet and a white blood cell. This shows how red blood cells, platelets and white blood cells are all produced from blood stem cells which are found in the bone marrow.