A needle is a thin metal or plastic tube that is used to pierce the skin. When it is used to donate blood, the needle is inserted into a vein in the arm. This allows the blood to flow out of...
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How Big Is The Needle To Donate Blood
When you go to donate blood, you will have to have your blood pressure taken. This is done with a blood pressure cuff. The cuff is placed around your arm and inflated. This squeezes your arm and causes your blood pressure...
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