White+Blood+Cells

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1.White blood cells are like soldiers protecting the body. 2.They have a rather short life cycle, living from a few days to a few weeks. 3. A drop of blood can contain from 7,000 to 25,000 white blood cells at a time. 4. If an invading infection fights back and persists, that number will significantly increaase. 5. White blood cells are continually on the lookout for signs of disease.