The red blood cell plays a major role in the circulatory system. http://hes.ucfsd.org/gclaypo/circulatorysys.html www.rudyard.org
Red blood cells are erythrocytes and never divide. They don't have a nucleus, meaning they don't have DNA or RNA. http://www.redbloodcellbooks.com/rbc7.html training.seer.cancer.gov
Red blood cells are made in the bone marrow. They transport oxygen from the lungs to cells all over the body. They stay in the blood stream for 120 days until removed by the liver or spleen. http://faculty.stcc.edu/AandP/AP/AP2pages/Units18to20/blood/redblood.htm www.xtremepapers.com
Vitamin B2 (Riboflavin) aids your body in the process of making red blood cells. Iron also plays a key role in forming complexes with oxygen and hemoglobin. http://umm.edu/health/medical/altmed/supplement/vitamin-b2-riboflavin www.sitri.it
The cells are small, round, and elastic, allowing them to pass through capillaries and make blood flow easy. They are red because the oxygen in them reacts with the hemoglobin. http://biology.about.com/od/humananatomybiology/ss/red-blood-cells.htm stephaniefuturedoc.files.wordpress.com

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