A blood transfusion is the administration of whole blood or a component to counteract blood loss caused by trauma, surgery, or disease. In some cases, whole blood is not needed or is unavailable, so an individual component—plasma, red or white cells, platelets—is used. In whole-blood transfusions, the donor’s blood must be compatible with that of the recipient. Autologous transfusions are those that use the recipient’s own blood, banked in advance. When was the first human blood transfusion? Discuss