What are two types of marrow do they do?

There are two main types of bone marrow: red bone marrow and yellow bone marrow.

- Red bone marrow: Red bone marrow is responsible for producing blood cells, including red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). It is found in the interior of most bones in children and in some bones in adults, such as the hip bone, sternum, and skull. Red bone marrow is essential for the production of new blood cells to replace old or damaged ones and to maintain the body's immune system.

- Yellow bone marrow: Yellow bone marrow is a storage site for fat and energy reserves. It is composed mainly of fat cells and is found in the interior of long bones, such as the femur and humerus. Yellow bone marrow can be converted to red bone marrow if there is a need for increased blood cell production, such as in cases of severe blood loss or anemia.