BSIP LAURENT / SCIENCE PHOTO LIBRARY BSIP LAURENT / SCIENCE PHOTO LIBRARY
Blood donation. Doctor removing blood from a donor's arm. The doctor is using a vacutainer, a device which automatically sucks up blood from the vein once it is punctured. Donated blood is thoroughly tested for bacteria and viruses, and for blood group, and is then usually stored in a blood bank until it is needed for transfusion. Most people feel no ill effects after giving blood, even though up to a tenth of the total blood in the body can be donated at any one time.
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