ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Blood donor. Nurse (phelbotomist) stopping the flow of blood (lower centre) from a donor into a collection bag. The rubber ball in the donor's hand had been rhythmically squeezed to encourage good circulation in his arm. Donor blood is given to patients in transfusions to replace lost blood, for example during surgery or after accidents.
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