1. Millions of Red Blood Cells Are Produced
Every second, your bone marrow is hard at work, producing an astonishing 2 to 3 million red blood cells. These essential cells travel through your bloodstream, carrying oxygen from your lungs to your body’s tissues and shuttling carbon dioxide back for exhalation. Without this relentless production, your organs and muscles would quickly become starved of oxygen. To learn more about this incredible process, visit the National Institutes of Health.