What term describes fat storage within bone marrow?

• A. Red bone marrow
• B. Yellow bone marrow
• C. Bone cortex
• D. Trabeculae

Answer: (B)

Fat storage within bone marrow is described by yellow bone marrow. As we mature, red marrow—responsible for producing blood cells—is gradually replaced by yellow marrow in the medullary cavity of long bones. Yellow marrow mainly consists of adipocytes that store fat and serve as an energy reserve; it can also revert to red marrow if the body needs to boost blood cell production during severe blood loss or anemia. The other terms refer to different bone structures: red bone marrow is the hematopoietic tissue, the bone cortex is the dense outer layer, and trabeculae are the lattice-like struts of cancellous bone inside.