The Importance of Blood Classification

Due to the recent campaigns for blood donors, people have become interested in what type of blood they have—group A or B, Rh-(positive) or Rh-(negative). What does it mean to be of group A or B and why cannot one type of blood be mixed with another? In order to understand the significance of blood classification, it is necessary to first understand a few simple facts about how blood reacts to various substances with which it comes into contact. If a foreign substance is introduced into the...