File Name: blood groups and red cell antigens laura dean .zip
For full document please download. Transcript Blood transfusion Blood transfusion is the process of transferring blood or blood-based products from one person into the circulatory system of another. Blood transfusions can be life-saving in some situations, such as massive blood loss due to trauma, or can be used to replace blood lost during surgery. Blood transfusions may also be used to treat a severe anaemia or thrombocytopenia caused by a blood disease. People suffering from hemophilia or sickle-cell disease may require frequent blood transfusions.
Blood transfusion is the process of transferring blood products into one's circulation intravenously. Early transfusions used whole blood , but modern medical practice commonly uses only components of the blood, such as red blood cells , white blood cells , plasma , clotting factors , and platelets. Red blood cells RBC contain hemoglobin , and supply the cells of the body with oxygen. White blood cells are not commonly used during transfusion, but are part of the immune system, and fight infections. Plasma is the "yellowish" liquid part of blood, which acts as a buffer, and contains proteins and important substances needed for the body's overall health. Platelets are involved in blood clotting, preventing the body from bleeding. Before these components were known, doctors believed that blood was homogenous.
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The term human blood group systems is defined by International Society of Blood Transfusion as systems in the human species where cell-surface antigens —in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them",  and include the common ABO and Rh Rhesus antigen systems, as well as many others; thirty-five major human systems are identified as of November In addition to the ABO and Rh systems, the antigens expressed on blood cell membrane surfaces include red blood cell antigens and 33 platelet antigens, as defined serologically. An individual, for example, can be AB RhD positive, and at the same time M and N positive in the MNS system , K positive in the Kell system , and Le a or Le b positive in the Lewis system , where these and many of the systems are named for patients in whom the corresponding antibodies were first detected. Blood is composed of cells suspended in a liquid called plasma. Suspended in the plasma are three types of cells:.
The ABO blood group system has been used in resolving many medico-legal issues related to paternity, by investigators in forensic science or in population studies by anthropologists.Faith L. 13.12.2020 at 05:55
Blood Groups and Red Cell Antigens is a guide to the differences in our blood types that complicate blood transfusions and pregnancy. Laura Dean.Leal O. 19.12.2020 at 06:15