Blood divided into groups based on the presence therein of certain antigens and antibodies thereto.There are four major groups of its 0 (I), A (II), In (III), and AB (IV).Each of them corresponds to the number, and the letter indicates the absence or presence of specific antigens.This is also an indicator of the compatibility.
People genetic blood counts do not change throughout life.This identifier personality that children inherit from their parents.Groups are more ancient than nationality and race.The main difference between different people, according to many scientists, is not the ethnic origin and skin color, namely in the blood.
most common blood - first.For transfusion, it is the most suitable because it does not contain antigens.The second is only suitable for people of the same, and the fourth group because of the presence of antigens A. The third is only suitable for owners of the third and fourth, and the last one can be poured only to people with the same blood group.
However, it is not only the presence or absence of antigens and Rh factor.It is determined by the presence of protein on the surface of erythrocytes.If it is, the Rh - positive, and if there is no - no.About 85% of the world's population have a positive Rh factor.For example, the third negative blood group is much less common than positive.The same applies to the others.
First, the most common blood group was detected in 45% of the world population.Next in order are the others.The rarest is a fourth group.If we take into account the Rh factor, it is the most common blood type - the first positive and the most rare - the fourth negative.
group and Rh must be considered when planning pregnancy.If the fetus inherits the father figures that will be incompatible with the mother's blood, during pregnancy may be a problem.However, modern medicine is fully capable to prevent them.
composition of blood formed many thousands of years and is associated with the development of the immune and digestive systems.Blood Group 1 positive in ancient times was all mankind.Digestion time was the most adapted to digest meat protein.Therefore, people in this category are still high acidity of gastric juice, and they are prone to ulcer.The first - is still the most common blood type.With increasing numbers of human flesh because of its scarcity it has become less affordable, so people increasingly began to eat the plants.This affected the quality of the blood, resulting in the emergence of other groups that have given people many useful qualities.
For example, owners of the blood to the gene A is better suited to life in the modern world.This gene at one time was the guarantee of the survival of the people during the terrible plague and cholera.People with this blood composition are less aggressive and have more contact with, which helps them feel good about themselves in society.
