People donate or give their blood away because other need extra blood when they are sick or hurt.People can lose lots of blood if they are injured like in a rood accident or if theygofor an operation.Some illnesses also cause blood problems.When one person's blood is given to another person,it is called ablood transfusion.So the blood is often separated into 1.Plasma
2.Red blood cells
3.platelets
and 4.White blood cells . Platelets might be given to patients with bleeding problems, while red blood cells would go to someone who was in a bad accident and lost lots of blood.
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