9 blood facts you might not know


Karl Landsteiner discovered blood types in 1901, watching how different people clot when mixed. He later classified them as A, B, and 0. According to this system, there are four blood groups: 0 (I), A (II), B (III), and AB (IV).


This system is not unique. Currently, there are 33 classification systems recognized by the International Society for Blood Transfusion, including Lutheran, Bombay, Duffy and even OK.

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A blood group is characterized by a different set of molecules on the surface of red blood cells. The mismatch of these molecules between the donor and the recipient can cause a fatal immune response after a blood transfusion.


Some blood types are very rare or exist only in certain ethnic groups. The first is the most common worldwide - about 45% of the population own it. Blood of the second group is the most common among Europeans, and its owners are 35% of the world population. The third group is found in 13%, people and the fourth - in 7%.


The fourth blood group (AB) is the youngest and, according to one version, was formed as a result of a mixture of Indo-Europeans and Mongoloids.


Blood types are not a unique feature of a person. For example, dogs have more than a dozen.


Before blood types were discovered, doctors experimented with transfusions between humans and animals. In December 1667, a doctor, Jean-Baptiste Denis, transfused a calf with a man in an attempt to cure him of a mental illness. After the second transfusion procedure, the patient began to vomit profusely, pain in the kidneys, and urine turned black. After the third transfusion, the man died. Denis was convicted of killing a patient, but he was acquitted when it became known that the patient was poisoned - but not with blood, but with arsenic.


Hematophages are creatures that feed on the blood of animals or humans. There are about 14 thousand such types of insects.


Hemophilia is a hereditary disease associated with a blood clotting disorder. Hemophilia A causes a deficiency in the blood of the required protein and is most common in approximately 85% of cases, unlike hemophilia B. In this disease, hemorrhages in the joints, muscles and internal organs occur. Today, hemophilia patients are treated with infusions of coagulation factor concentrates, which are made from donated blood.

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