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.
- Antigen A determines blood type A.
- Antigen B is present in blood type B.
- Type AB has both antigens.
- 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
:
- The immune system of a person with blood type A can make antibodies to B.
- The blood type B will make anti-A antibodies for the antigen A.
- The type O, which does not possess antigens, does not recognize A or B, and makes antibodies for them.
- The body of a person with blood type AB will not make antibodies, because it recognizes both antigens.
This means that <u>a specific blood type does or does not possess an antigen, but does not include the antibody</u>. The body's defenses are what make the antibody when it comes into contact with the antigen that it does not recognize.
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