The soft bone marrow inside many of our bones is where most of the blood cells flowing through our bodies are made. The bone marrow contains stem cells, which produce the body’s red blood cells and platelets, and some types of white blood cells. Red blood cells carry oxygen to the body’s tissues, and platelets help with blood clotting when someone has a cut or wound. White blood cells help the body fight infection.
Two varieties of bone marrow are found in the human body. The yellow variety stores fat, while the red variety produces red blood cells, various kinds of white blood cells, and platelets. Most of the blood cells are made in large bones such as the arm bones, breastbone, leg bones, ribs, and spine. We are born with only red bone marrow, but as we age, more yellow marrow gets produced.
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