Because they are seen as pathogen invaders by the immune system.
The blood type notation A Rh- indicates which antigens and antibodies are present in the blood. A indicates there are A antigens. Rh+ indicates there are Rh antigens. B antibodies. If there are A and Rh antigens but no B antigens, the antibodies in the blood plasma are B antibodies.
Since that person has anti-B antibodies, then A antigens are present in her red blood cells. Since that person doesnt have anti-A antibodies, then there are no B antigens present, which means the person has A type blood.
Antibodies.
Type A blood will produce antibodies against B antigens.
B+ here is a guide for you: type A - A antigens B antibodies; type B - B antigens A antibodies; Type AB - A&B antigens and no antibodies; type O - no antigens and A&B antibodies. for the rh you just have to add if it is + or -.
Because the blood cells from the O-group donor have no antigens which would react with the A-antibodies in the recipient.
It is the antigens that determine ones blood group.
Type B blood has B antigens on the surface of its red blood cells. In addition to these B antigens, type B blood also contains A antibodies in the plasma, which can react against A antigens found in type A blood. This combination of antigens and antibodies is crucial for blood transfusions and compatibility.
Antigens are displayed on the surface of a macrophage after the digestion of a bacterium.
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Antibodies and /or anti - antigen.
Type B antibodies react to type B antigens by begining to clump together, and the clumps may block blood vessels.