Tipos De Sangre (Ingles)

In some ways, every person's blood is the same. But, when analyzed under a microscope, distinct differences are visible. In the early 20th century, an Austrian scientist named Karl Landsteinerclassified blood according to those differences. He was awarded the Nobel Prize for his achievements.
Landsteiner observed two distinct chemical molecules present on the surface of the red blood cells. Helabeled one molecule "A" and the other molecule "B." If the red blood cell had only "A" molecules on it, that blood was called type A. If the red blood cell had only "B" molecules on it, that bloodwas called type B. If the red blood cell had a mixture of both molecules, that blood was called type AB. If the red blood cell had neither molecule, that blood was called type O.
If two different bloodtypes are mixed together, the blood cells may begin to clump together in the blood vessels, causing a potentially fatal situation. Therefore, it is important that blood types be matched before bloodtransfusions take place. In an emergency, type O blood can be given because it is most likely to be accepted by all blood types. However, there is still a risk involved.
The clumped red cells cancrack and cause toxic reactions. This can have fatal consequences. Karl Landsteiner discovered that blood clumping was an immunological reaction which occurs when the receiver of a blood transfusion hasantibodies against the donor blood cells.
AB0 blood grouping system
According to the AB0 blood group system there are four different kinds of blood groups: A, B, AB or 0 (null).
| Blood group AIf you belong to the blood group A, you have A antigens on the surface of your red blood cells and B antibodies in your blood plasma. |
| Blood group B
If you belong to the blood group B, youhave B antigens on the surface of your red blood cells and A antibodies in your blood plasma. |
| Blood group AB
If you belong to the blood group AB, you have both A and B antigens on the surface...