The blood transfusion experiments before the twentieth century gave results that would cause grave and disappointment.

The blood vessels of the red blood cells are classified by the human blood according to the substances showing “antigen” . In 1900 Karl Landsteiner showed that the blood was in the four main groups, and that these groups differed in person
. This grouping is known as the ABO system. Landsteiner’s discovery opened the door to safety in blood. In 1940, Landsteiner and his colleague American Pathologist Alexander S. Wiener discovered a new system in the blood group.

ABO system: According to this system, each person enters into one of four blood groups. Groups A, B, AB, and 0.
Separation involves red blood cells and specific proteins found in the plasma. Proteins in the plasma are called “agglutinins” and red blood cells are called “agglutinins”. There are two classes of agglutinins, called α and β, called aglutinins, α (alpha) and β (beta).

If the blood of this person is given to a group B carrying agglutinin and α agglutinin, then the agglutinin will bind to the aggutinin in the blood of the recipient. This collapse happens all around the body and is incompatible with life. The small amount of precipitate that occurs in a relatively small amount of blood will damage many organs by blocking the various vessels.
The group of people in the AB group and the Agglutinins in the B group. However, their plasma does not contain agglutinin. In group 0, there are no agglutinins but α and β agglutinins.

Aglutinins and agglutinins have been demonstrated in the blood groups of tabloda.

Aglutinins and agglutinins have been shown in the blood groups of the tabloda.

β (Anti A)
B ……………… B ……………… (Anti B) AB AB AB …………… 0 ……………………………………………………………… a, b (Antia and B)

As the table shows, the naming of groups is based on aglutinogens.

The AB group is given the “general recipient” group, and the non-agglutininogenic group is given the “generic donor” group names.
Look at the table: When a blood transfusion meets the same letter aglutinin and agglutinin,

Rh system: Rhesus protein, also called Rh factor, is a special protein on red blood cells.

Administration of Rh (-) blood to Rh (+) does not produce any reaction. Rh (-) person
When the Rh (+) blood is given, no event occurs in the first transmission. At this time, however, the anti-Rh antibodies against the blood Rh factor in the serum of the recipient’s blood are formed. The same is true for the Rh (+) child born to Rh (+)
father and Rh (-) mother. Because the anti-Rh antibodies against the Rh (+) antigen of the child come into play in the serum of the Rh-negative mother. When these antibodies are passed on to the fetus in the subsequent
pregnancy with the mother’s blood, hemolytic anemia occurs immediately after the birth or immediately followed by death due to it. When the second Rh (+) blood is given, the anti-Rh antibodies which the body gives to the first naked eye react with the donor blood and intravenous precipitation occurs.

The child’s blood group may not resemble his / her parents: the child’s blood group is similar to that of his father or mother
. The vassal is neither alike nor similar to either.

There were only two kinds of blood on the earth if the child had no blood type other than the blood type of his parents.
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