NEETZoologyBody Fluids and Circulation
What is the other blood grouping system besides the A, B, AB and O systems?
Options
- AThe presence or absence of antigen C
- BThe presence or absence of antigen D
- CThe presence or absence of Rh factor
- DThe presence or absence of antigen E
Correct answer
C. The presence or absence of Rh factor
Step-by-step solution
Another antigen, the Rh antigen similar to one present in Rhesus monkeys (hence Rh), is also observed on the surface of RBCs of majority (nearly 80 per cent) of humans. Such individuals are called Rh positive (Rh+ve) and those in whom this antigen is absent are called Rh negative (Rh-ve). An Rh-ve person, if exposed to Rh+ve blood, will form specific antibodies against the Rh antigens. Therefore, Rh group should also be matched before transfusions.