Blood from ancient times has caused great interest to mankind, or rather its composition and properties. She was credited with many mystical signs. In ancient times, it was considered a source of divine energy and endowed with the ability to make the earth more fertile. Even in our time, wine is used in church rites of some religions, which personifies the blood of Christ. What are its properties in fact?
The proportion of this component in the adult human body is about 6-8 percent of the total mass. In children, this figure is even higher, 8-9 percent. Blood is constantly circulating throughout the body and throughout all organs.
There are four main blood types. Among them there are those that are quite common, but one of them is a rare blood type. This sign is unchanged throughout the course of a person’s life. What is it and what is the rarest blood type, we will consider further.
The division of blood into groups using the ABO system and division using the Rhesus system is considered traditional. As you know, there are four main groups. The first group - I (0), is considered the most common. Its carriers are about 45 percent of all the inhabitants of the planet. The second II (A) is also quite common, with 35 percent of the world's inhabitants, mostly Europeans. Less common is the third group III (B). Only 13 percent of the world's inhabitants possess it. Very rare blood type, last, fourth IV (AB). Its carriers are only 7 percent of the world's population. She is considered the youngest.
There are several hypotheses regarding the occurrence of the fourth blood group. One version of its appearance is associated with epidemics that have raged on the planet in the last 500 years. As a result, blood evolved, and as a result, this species arose.
According to another version, this rare blood type occurred as a result of a mixture of two races - black and yellow. Such marriages are rare, and accordingly this species is very rare.
Well, the third version of the appearance of the fourth variety of blood was the version about the change in the nature of people's nutrition. They began to eat meat, which is subjected to a longer heat treatment. Many products of artificial origin have appeared. However, scientists have not yet studied this question to the end.
Blood type in many ways affects the human body. It is believed that its character depends on it. In addition, there are special diets that are selected and prescribed depending on this factor.
The dependence of the predominance of a certain group on racial and national identity was also revealed. So, the second blood group dominates among Europeans . The majority of the inhabitants of the East are the owners of the third. Among the representatives of the black race , the first group predominates. However, for all inhabitants of the Earth, a rare blood group is the fourth.
It is assumed that the prevalence in a certain region of the planet of one of the groups was influenced by the diseases that raged there. For example, plague and smallpox affected mainly people with the first group. Thus, there was a natural selection among Europeans.
In Japan, a study was conducted and revealed the dependence of the nature of people on their blood type. It is also known that marriage between representatives of different genotypes is undesirable. A genotype that is stable in a particular race is destroyed as a result of mixed marriage. The child gets a new gene complex that is unstable to biological factors, and the number of hereditary diseases increases significantly.
You may have learned a lot for yourself: For example, which blood type is rare and what is it associated with. But blood and its properties have not yet been studied, and much remains a mystery.