Blood transfusion is one of the great achievements of modern medicine. In many cases, blood transfusion is very important to save patients.
People's blood types are divided into four types: type A, type B, type AB and type 0. But how to distinguish is based on the difference between erythrocyte agglutinin and plasma agglutinin. Red blood cells of type A blood contain lectin A,
There is lectin p in plasma; Type B blood cells contain lectin B, and plasma contains lectin ct. Type AB red blood cells contain lectin A and lectin B, while plasma contains no lectin. However, type 0 red blood cells do not contain any lectin, and lectins A and P exist in plasma at the same time.
It must be tested before blood transfusion, and blood transfusion can only be carried out between people with the same blood type. If the blood type does not match, it will cause blood agglutination, and red blood cells will contract and deform, which will seriously endanger life.
So how is agglutination caused? We assume that lectin A and lectin A, lectin B and lectin P are two pairs of enemies. When they meet together, there will be contradictions-agglutination reaction.
The agglutinin in the plasma input during blood transfusion can be diluted by a large amount of plasma in the body, which will not play much role. However, lectins in red blood cells are different. After the blood is injected, it will move around and make waves, and problems will arise when it meets the "enemy". So the blood type we mentioned above is mainly determined by the lectin in red blood cells.
Now it's time to understand why blood types are incompatible and blood transfusion is not allowed. Therefore, when you want a blood transfusion, you must first find out your blood type.