Cross Section of a long bone below:
In children red marrow dills the center of long bones this red marrow is replaced with yellow marrow as children become adults.
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Red bone marrow is hematopoietically active, responsible for the production of blood cells, while yellow bone marrow is primarily composed of fat cells and serves as an energy reserve. Red bone marrow is found in the cavities of spongy bone, while yellow bone marrow replaces red bone marrow as we age.
Red marrow is found in spongy bone, and makes blood. Yellow marrow is found in the medullary cavity and stores fat.
Red bone marrow is a factory that makes red blood cells, white blood cells and platelets. Yellow marrow is composed mostly of fat and looks yellow.
The medullary cavity is a space within the diaphysis (shaft) of a long bone. It contains yellow bone marrow, which stores fats and serves as an energy reserve. Additionally, the medullary cavity provides space for blood vessels and nerves to pass through the bone.
Diploe does not belong because it refers to the inner layer of flat bones like the skull that contains both spongy and compact bone. Spongy bone, red marrow, hematopoiesis, and yellow marrow are all related to bone structure and function.
Yellow marrow is the type of bone marrow found in the central cavities of long bones of adults. It is mainly composed of fat cells and serves as a fatty reserve for energy storage. Yellow marrow can convert to red marrow in certain situations, such as during periods of increased blood cell production.
Yellow bone marrow stores fat, which the body consumes as a last resort in cases of extreme starvation. It also turns into red marrow in emergencies such as blood loss or anemia. Miraculously, this process can happen in just a few hours. Red bone marrow produces all blood cells, except lymphocytes which are produced in the marrow and reach maturity in the generative lymphatic tissues, such as the thymus gland or bone marrow.
Yellow marrow is mainly composed of fat tissue. It is found in the central cavities of long bones and is the predominant type of marrow in adults.