👉 Marrow bones are soft, white tissue that often appears in the bone marrow of a person's body. They are found in all adult humans and their presence is due to the fact that they provide blood cells for the blood clotting process. Marrow bones can be found in various parts of the human body, including the liver, spleen, heart, lungs, kidneys, and brain. The marrow bone serves as a reservoir for red blood cells during periods of intense physical activity or when there is