Karl Landsteiner discovered in 1900 AD that there are four classes of blood in humans and named these classes A, B, AB and O.
The reason for the difference in different blood groups is the special glycoproteins found on the cell membrane of RBCs called antigens.
Antigens and antibodies
|Social class||Antigen in cell RBC||antibodies in plasma||blood group to be given||nonspecific blood group|
|A||A (Antigen)||B(Antibody)||A and O||B and AB|
|B||B||A||B and O||A and AB|
|AB||A and B||None||A, B, AB, O||,|
|O||None||A and B||O||A, B and AB|
A human with AB blood group is called a universal recipient and a human with O blood group is called a universal donor.
In India, the highest blood group is found in B (34.5%) and on the second number, O blood group and the least number of people are found in AB blood group.
In 1940 AD, Landsteiner and Wiener detected another type of antigen in the blood (discovery in Rhesus monkey) which is called Rh factor, in which it is present in them Rh+ and in which this Absent is called them Rh-.
Erythroblastosis Fetalis: If the father is Rh+ and the mother is Rh-, then all children born (except the first child) die during pregnancy or sometime after birth.
Anemia occurs when there is a lack of blood.
blood pressure sphygmomanometer is measured from. The blood pressure in a normal person is 120-80 mm/Hg.