What is the tissue called that is found in small bones where red and white blood cells are made?

The tissue found in small bones where red and white blood cells are produced is called bone marrow. Specifically, red bone marrow is responsible for hematopoiesis, the process of generating blood cells. In adults, red bone marrow is primarily located in the flat bones, such as the pelvis, sternum, and ribs, as well as in the ends of long bones.