DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY DAMIEN LOVEGROVE / SCIENCE PHOTO LIBRARY
Blood donation. Nurse checks the progress of a man donating blood for the treatment of others. A needle has been inserted into the donor's arm and blood is being collected in a bag. Donors lie down during a donation partly to relax them and partly to allow their body to gradually adjust to the loss of blood. About 0.5 litres of the 4.5-6 litres of blood in circulation is collected during a donation. After donation, the blood is checked to ensure it is free from infections such as HIV, syphilis or hepatitis. Blood free from infection will be used for transfusions or separated into components to treat particular medical conditions.
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