Each blood group is represented by a substance on the surface of red blood cells (RBCs). These substances are important because they contain specific sequences of amino acid and carbohydrate which are antigenic. As well as being on the surface of RBCs, some of these antigens are also present on the cells of other tissues
A lot more info here
http://en.wikipedia.org/wiki/Blood_types
2006-08-07 06:00:13
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answer #1
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answered by Steve C 4
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In addition to the information already posted, the + or - denotes the presence or absence of the Rhesus antigen on the RBC surface. This occurs independently of the AB antigens.
The main implication of all this is that your body will accept some types of blood and reject others (unless you are AB+, in which case you will accept all of the other 7 main types of blood)
2006-08-07 06:20:39
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answer #2
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answered by Graham I 6
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it is nothing but only due to antigens and anti bodiesBlood group AB individuals have both A and B antigens on the surface of their RBCs, and their blood serum does not contain any antibodies against either A or B antigen. Therefore, an individual with type AB blood can receive blood from any group (with AB being preferable), but can only donate blood to another group AB individual.
Blood group A individuals have the A antigen on the surface of their RBCs, and blood serum containing IgM antibodies against the B antigen. Therefore, a group A individual can only receive blood from individuals of groups A or O (with A being preferable), and can donate blood to individuals of groups A or AB.
Blood group B individuals have the B antigen on their surface of their RBCs, and blood serum containing IgM antibodies against the A antigen. Therefore, a group B individual can only receive blood from individuals of groups B or O (with B being preferable), and can donate blood to individuals of groups B or AB.
Blood group O individuals do not have either A or B antigens on the surface of their RBCs, but their blood serum contains IgM antibodies against both A and B antigens. Therefore, a group O individual can only receive blood from a group O individual, but they can donate blood to individuals of any ABO blood group (ie A, B, O or AB).
2006-08-07 06:04:03
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answer #3
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answered by koolkad 1
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