Article: I know about white blood cells and how they eat germs and toxins. I've also learned about red blood cells, but I don't know what they do. What do red blood cells do?(Ask Doctor Cory)

Dear Elizabeth:

Red blood cells, or erythrocytes (eh-RITH-row-sites), are tiny cells that look like doughnuts without the hole in the middle. There are about 250 million red blood cells in each drop of your blood. Their ...

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