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Blood type horoscope cards in Japan. The blood type personality theory[ 1] is a pseudoscientific belief prevalent in Japan which states that a person's blood group system is predictive of a person's personality, temperament, and compatibility with others. [ 2] The theory is generally considered a superstition by the scientific community.
A blood type (also known as a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system.
The Rh blood group system is a human blood group system. It contains proteins on the surface of red blood cells. After the ABO blood group system, it is the most likely to be involved in transfusion reactions. The Rh blood group system consisted of 49 defined blood group antigens [ 1] in 2005. As of 2023, there are over 50 antigens among which ...
Doctor holding tube of specific blood type. The average adult has between 1.2 and 1.5 gallons of blood in their body, accounting for roughly 10% of their weight. Despite it being such a large, and ...
Type D personality. Type D personality, a concept used in the field of medical psychology, is defined as the joint tendency towards negative affectivity (e.g. worry, irritability, gloom) and social inhibition (e.g. reticence and a lack of self-assurance ). [ 1] The letter D stands for "distressed".
ABO blood group antigens present on red blood cells and IgM antibodies present in the serum. The ABO blood group system is used to denote the presence of one, both, or neither of the A and B antigens on erythrocytes (red blood cells). [ 1] For human blood transfusions, it is the most important of the 44 different blood type (or group ...
Four temperaments. The four temperament theory is a proto-psychological theory which suggests that there are four fundamental personality types: sanguine, choleric, melancholic, and phlegmatic. [ 2][ 3] Most formulations include the possibility of mixtures among the types where an individual's personality types overlap and they share two or ...
Type A is common in Central and Eastern Europe. In countries such as Austria, Denmark, Norway, and Switzerland, about 45–50% of the population have this blood type, whereas about 40% of Poles and Ukrainians do so. The highest frequencies are found in small, unrelated populations. For example, about 80% of the Blackfoot Indians of Montana have ...