BLOOD AND IMMUNE SYSTEM
Blood transfusion is the process of receiving blood products into ones circulation intravenously.
Transfusions are used in a variety of conditions to replace lost components of blood. Early trans-
fusion used whole blood but modern medical practice commonly uses only components of
theblood such as red blood cells, white blood cells, platelets, plasma, clotting factors. Globally
85million units of red blood cells are transfused in a given year. Blood: -Is a living tissue