Answer:
In Anti-B box what can be seen are cells that are agglutinated when exposed to the anti-B antibody, which means that the blood type is B.
Step-by-step explanation:
In reference to the ABO system, blood types are determined by surface antigens present on the erythrocyte membrane, so that
- Blood type A has surface antigen A, but anti-B antibodies.
- Blood type B has surface antigen B, and anti-A antibodies
- Blood type AB has A and B antigens, so it does not generate antibodies
- Blood type O has no antigens, but can make antibodies to both antigens.
This is the basis of compatibility by blood group, according to the ABO system.
What happens in the chart?
It is an agglutination test, where samples of a blood type are exposed to anti-A and anti-B antibodies, to produce a reaction that destroys red blood cells that are sensitive to one antibody or another.
In the Anti-B box it is observed that the cells are agglutinated, so the blood type is B, sensitive to the exposure to anti-B antibodies. It is not sensitive to anti-A, because it produces them, which can be seen in the box that says anti-A.