What are antiagglutinins and agglutinos? Thank you

The agglutination originally attaches to the surface of red blood cells and is an antigen. Lectins are found in plasma (or serum) and are antibodies against the eponymous lectin. Erythrocyte agglutination occurs when the eponymous agglutina and agglutination meet (e.g., agglutinin A and lectin B).

Human red blood cells contain two types of lectins, called A and B, and human serum contains two kinds of lectins that oppose lectin, called anti-A lectin and anti-B lectin. Each person's serum does not contain lectins, which are opposed to his own erythrocyte agglutinin.

Only the original A of red blood cells is blood type A, and there is anti-B lectin in the serum; Only the original B agglutinum on the red blood cells is type B blood, and there are anti-A lectins in the serum; The two agglutinogens A and B on red blood cells are AB blood type, and there are no anti-A and anti-B lectins in their serum; Those who have no agglutinates of A and B on red blood cells are type O, and their serum contains both anti-A and anti-B lectins. Red blood cells with proagglutinin A can be agglutinated by anti-A lectin; Anti-B lectins agglutinate red blood cells containing proagglutinated B. If the blood group is incompatible during blood transfusion, the transfused red blood cells will agglutinate, causing vascular occlusion and a large amount of intravascular hemolysis, causing serious consequences.

Therefore, blood grouping must be done before blood transfusion. Normally, only people with the same ABO blood type can have blood transfusions with each other. In emergency situations where blood isotype blood is lacking, red blood cells of type O cannot be agglutinated and can be transfused to people of any other blood type.

People with type AB have no lectins in their serum and can accept any type of red blood cell.

It is a protein that undergoes agglutination reaction

For example, people with blood type A have agglutina in red blood cells and anti-B lectins in serum, while people with blood type B have B agglutinin and anti-A lectin in serum, and there is no agglutinin in O, only A, B lectin in serum, and type AB has A, B lectin and no lectin.

From this, the blood group relationship of blood transfusion can also be deduced

An antigen that attaches to the surface of red blood cells called lectogen;

An antibody that is present in the blood plasma and specifically works against the eponymous lectin, called lectin.

As for the function: the blood type of a human being is determined based on the agglutination in your body!

If you have a lectin, then you have blood type A, and you have anti-B lectin in your body; With B agglutinin, then you are blood type B, and you have anti-A lectin in your body; If you don't have both, you have blood type O, and you have two kinds of lectins, anti-A and anti-B, in your body; If you have both, then you have AB blood type and there is no lectin in your body.

If it's just for the sake of a simple distinction, then remember: the agglutination is on red blood cells, the same as blood type; Lectins are in the blood plasma, the opposite of your blood type.

I didn't figure it out either, alas...