Question

What type of blood contains A antibodies (but not B antibodies) in the plasma and lacks Rh antigens?

Answer 1

Whatever antibodies develop in a person’s body depends upon the type of antigen present on their RBC. The antibodies are Y-shaped proteins that bind like a lock-and-key to the body's foreign invaders or germs whether they are viruses, bacteria, fungi, or parasites.

Complete answer:
Antibody A but not B antibodies are present in the plasma of the blood group B which also has B antigen on the RBC. Similarly, blood group A has A antigen on the RBC and B antibodies in their plasma. Blood group O lacks antigens but it has both the antibodies A and B in their plasma whereas blood group AB has both the antigens A and B on the RBC but has no antibodies in their plasma.

Additional Information:
-The name or type of blood group depends upon the type of antigen present on the RBC. So a person with A antigen on the RBC has the blood group A.
-On the RBCs, there present various antigens including the ABO antigens in which there are two antigen types A-type and the B-type, the Rh antigen, the Duffy antigen, and other several minor ones.
-When these antigens are native to our body they are normal and do not produce an immune response. But when they are introduced to a person in which these antigens are not native, they produce an immune response forming antibodies. For example, if a person with an Rh-negative blood type is given Rh-positive blood she or he will form antibodies against the Rh antigens. However, the Rh-negative person will not have antibodies against Rh in his system if he
has never been introduced to Rh antigens.
-There is no exception in the case of ABO antigen.
-Person with blood group A will also have antigen A but have developed antibodies against the B antigen even if they have never been introduced to the B antigen previously.
-The antibodies start producing or developing soon after the birth of a child when the large intestine is colonized by bacteria and these produce antibodies.
-Blood group A with Rh-positive has A antigen, Rh antigen, and antibodies against B antigen. Blood group B with Rh-positive has B antigen, Rh antigen, and antibodies against A antigen. Blood group O with Rh-positive has Rh antigen, antibodies against A and B antigens whereas blood group AB with Rh-positive has both A and B antigens, Rh antigen, but no antibodies against A or B.

Note:
-Rh short form for Rhesus which is a type of monkey that was discovered in Africa.
-The formation of antibodies takes place as an immune response to whichever antigen is not native to the baby.
-Rh antigens are absent in persons with Rh-negative but also there are no antibodies against the Rh antigen.