What is true about yellow bone marrow?

Yellow bone marrow is primarily composed of adipose (fat) tissue and serves as an energy reserve for the body. One of its key characteristics is that it can revert to red bone marrow when the body is in a state that requires increased production of blood cells, such as during severe blood loss or anemia. This adaptability is crucial for maintaining hematopoiesis (the production of blood cells) in response to the body's needs.

In contrast, the other assertions do not accurately reflect the nature of yellow bone marrow. While yellow bone marrow does not constantly produce red blood cells, its ability to transition back to red marrow showcases its functional importance in hematopoiesis under specific circumstances. Additionally, yellow bone marrow is not exclusive to long bones; it can also be found in other bone types throughout the body. It fundamentally consists of fat cells, which is a defining feature, further supporting the accuracy of the characteristic highlighted regarding its functionality.