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Organization that collects, stores, processes, and supplies blood. Most blood donations are separated into components, which can be frozen and stored longer than whole blood and used by multiple patients. In hemapheresis, large amounts of one component can be separated from a single donor's blood and the rest returned to the donor. Before World War I, a physician had to find a compatible ...

Etymology: L, trans + fundere, to pour. The introduction into the bloodstream of whole blood or blood components, such as plasma, platelets, or packed red blood cells. Whole blood may be infused into the recipient directly from a donor matched for the ABO blood group and antigenic subgroups, but more frequently the donor's blood is collected and stored by a blood bank. See also blood transfusion...

Classification of blood by inherited antigens associated with erythrocytes (red blood cells). The ABO blood-group system and Rh blood-group system are among those most commonly considered. Without identification of these factors, blood transfusion from an incompatible donor may result in destruction of red cells or coagulation. Blood typing also helps ...

... feeding is necessary), blood, or blood plasma (see blood transfusion ). An intracutaneous injection is the introduction of a small amount of fluid between the skin layers. A subcutaneous injection is directed to the tissues under the skin. When quicker absorption of a drug is required, an intramuscular injection may be used; even more rapid action is ...

Circulatory fluid ( see circulation) in multicellular animals. In many species it also carries hormones and disease-fighting substances. Blood picks up oxygen from the lungs and nutrients from the gastrointestinal tract and carries them to cells throughout the body for metabolism. It picks up carbon dioxide and other wastes from those cells and transports them ...