Surely bone marrow must be one of the most creative developments of evolution. Secreted away in the bones (when asked, most middle schoolers think blood is made in the heart--logical but wrong), the marrow produces the cells that carry oxygen and provide immunity, each carefully "back- regulated" by affected organs.Sensitive to multiple environmental toxins, the marrow is protected by the hardest substance known. Still, we can harm it with what we ingest and where we go. Be good to your bone marrow this week!
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