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Name: Amy J.
Status: student
Age: 14
Location: N/A
Country: N/A
Date: 2/23/2003

Do all bones have real bone marrow?

When you say "real" bone marrow what do you mean? There are 2 types of bone marrow: red and yellow. Red marrow is where blood cells are made. There are 2 types of bones as well: those that have spongy bone tissue and those that have compact tissue. The oddly shaped bones and the ends of long bones usually are mostly spongy bone with a layer of compact bone around them. So bones like the breastbone (sternum), and the ends of your leg and arm bones have red marrow in them. The shafts of the long bones are hollow and are filled with yellow marrow, which does not make blood cells. If you look at a round steak or certain beef roasts that contain bones, sometimes there are long bones that have been cut crosswise and you can see the yellow marrow that fills their center.


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