Blood, the water of life, is what doctors know as a dark viscous fluid that fills the blood vessels and capillaries (veins and arteries) and is rushed to all parts of the body by the contraction of the heart muscle, and the amount of blood in humans varies according to age. On average, Liters of blood. It consists of plasma and platelets; white blood cells and red blood cells. It is red because of the presence of hemoglobin, which gives the blood this color, and its color varies in the human body as it exists either in the arteries or veins. If the blood in the arteries is red color is caused by the presence of oxygen; in the veins and because of the presence of carbon dioxide is red dark.
Blood transfusions in ancient times were known, but many deaths occurred in blood transfusions because of the belief that blood was all one. For this reason, this process has been stalled for a long time until Karl Landsteiner discovered a substance called blood inductants, sugary proteins found on the surface of the red blood cell. The function of these sugary proteins is to determine the type or type of blood in humans, which is hereditary. There are two kinds of genes in the human world. The world is called “A” and “B” by the world, so that it can determine the type of blood or what is now known as the “blood group”.
Each gene contains a pair of genes. In the case of a blood group, the symbols called by Karl are the symbolic genes of the blood group. Those who meet the two symbols – A and B – have a type of blood type AB, The second gene is devoid of any hereditary traits. The blood group is the same as the existing gene. For example, if the existing gene A and the other are not present, then the blood type A will be in the same vein to determine the blood type (B). In the absence of genes at all, the blood type O. The scientists also discovered the existence of another genetic factor called the name of the factor Raysi, in relation to the monkey Raysi, because the first time they discovered this factor was through this monkey because it holds this attribute. If this agent – a glycoprotein – exists, give the blood the positive signal (+), and if it does not exist then give it the negative signal (-). Thus, we find ourselves in front of four major blood groups; each species has two types, positive and negative.
The relationship between these different blood groups is the basic rules in the process of transfusion of blood from one person to another, there are of these factions of taking from others and there are those who take only from the same platoon or the consequences were dire. And what governs the process of accepting the discount or not is the presence of the factor in the blood transfusion and its presence in the person transferred to it, and from this relationship, we find that the blood of the O-type, is the most difficult types of blood, because it takes only from the same platoon, Someone who carries this species has the blood of another species; the blood will clot and the patient dies immediately. The bloodiest groups are AB and B – each 1% of the total population, but the risk to health and the fear of lack of blood in case of need – God forbid – does not exist at all; Of the blood type (O-).