Question

Why does any group of blood have anti-body without any strange material going into the body? For example, automatically group A has anti-gain A and anti- body B.​

Answer 1

Answer:

Red blood cells have surface antigens, which allow their identification in blood groups, but not antibody. Antibodies develop when the organism comes into contact with an unknown antigen.

Explanation:

Red blood cells can be classified in groups by the existence of surface antigens on the erythrocyte membrane.

1. Antigen A determines blood type A.
2. Antigen B is present in blood type B.
3. Type AB has both antigens.
4. Group O does not have either antigen A or antigen B.

When a person comes into contact with an antigen that does not possess, he can make antibodies to that antigen, so that :

1. The immune system of a person with blood type A can make antibodies to B.
2. The blood type B will make anti-A antibodies for the antigen A.
3. The type O, which does not possess antigens, does not recognize A or B, and makes antibodies for them.
4. The body of a person with blood type AB will not make antibodies, because it recognizes both antigens.

This means that a specific blood type does or does not possess an antigen, but does not include the antibody. The body's defenses are what make the antibody when it comes into contact with the antigen that it does not recognize.