Human blood types are typically classified by the ABO blood group in the Rh blood group systems each individual has blood type consisting of a combination of a BAB or O from the ABO blood group and either positive or negative from the Rh blood group for example blood type being negative blood types are inherited treat in the proportion of each blood type berries from reason to region
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Sri K.
Blood Types and Rh Factors In addition to being grouped into four types, human blood is grouped by its Rhesus (Rh) factor. Consider the figures below that show the distributions of these groups for Americans. A person has type AB negative blood.
Amman Z.
Blood Typing Blood types are genetically determined traits based on the presence or absence of specific glycoproteins (antigens) embedded in the cell membranes of RBCs. Although human RBCs display many different antigens, only those in two groups—the ABO system and the Rh system—are routinely typed. There are four variants in the ABO system, and two variants in the Rh system; therefore, the combined use of these two blood typing systems produces eight major blood types, as shown in. The four variants in the ABO system are A, B, AB, and O. Type A blood contains RBCs displaying A antigens. Type B blood contains RBCs displaying B antigens. Type AB blood contains RBCs displaying both A antigens and B antigens. Type O blood contains RBCs that display neither A antigens nor B antigens. The ‘‘Rh" in the Rh system stands for rhesus monkey because the Rh antigen (also called the Rh factor) was first discovered in this primate. There are only two blood types in the Rh system. Blood containing RBCs with Rh antigens is considered Rh positive (Rh+), whereas blood with RBCs that lack Rh antigens is considered Rh negative (Rh-). The plasma portion of blood also contains specialized proteins called antibodies, which chemically react with (bind to) specific types of antigens. When an antibody encounters its specific antigen, the two will bind. In the case of blood, should an antibody in plasma meet its specific antigen on an RBC, the resulting binding produces an agglutination reaction (the clumping of RBCs). To cite one example, the type of antibody that binds with an A antigen is called an anti-A antibody. The plasma of type A blood contains anti-B antibodies, that of type B blood contains anti-A antibodies, that of type AB blood contains no antibodies, and that of type O blood contains both anti-A antibodies and anti-B antibodies. These antibodies begin forming shortly after birth. The plasma of Rh+ blood lacks antibodies against the Rh antigen. Unlike antibodies against the ABO antigens, antibodies against the Rh antigen are produced only when an individual is exposed to the Rh antigen. Thus Rh+ blood lacks antibodies against the Rh factor, and individuals with Rh- blood do not produce antibodies against the Rh factor unless they are exposed to it. Such exposure can occur during a blood transfusion or during childbirth. Complete the following table: Blood Type | Antigens Present on Surface of RBCs | Antibodies Present in Plasma | Can Receive Blood from Blood Type(s): | Can Donate Blood to Blood Type(s): ---|---|---|---|--- A- | | | | O+ | | | | AB- | | | | B+ | | | |
Madhur L.
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