There are 26 blood group systems discovered by human beings, of which ABO system is the most commonly used and important, followed by RH system, and the rest are basically academic research, which has little significance in daily practical fields.
ABO blood group system includes: type A blood,
Type b blood,
Type o blood,
Type AB blood (that is, our common blood type)
Rh is a Rhesus monkey.
The first two letters of foreign names. Randsteiner and other scientists found that rhesus monkeys and most human red blood cells have antigen substances of Rh blood group when doing animal experiments in 1940, hence the name. Anyone with Rh agglutinin on red blood cells in blood is Rh positive. Conversely, it is negative (usually called panda blood). In this way, people who have found four main blood types of red blood cells, A, B, O and AB, are divided into Rh positive and RH negative respectively. RH-positive is a common blood type. Without RH, it is usually called type A, type B, type O or type AB. Most people are positive, and people with Rh negative can't accept the blood of people with RH positive, because the antigen in RH positive blood will stimulate people with RH negative to produce RH antibodies. If RH positive blood is transfused again, it will lead to hemolytic transfusion reaction. However, RH-positive people can receive blood from RH-negative people. Rh system is probably the most complex system in red blood cell blood group, and its importance is second only to ABO system.
In China, RH-negative blood group only accounts for three to four thousandths. The ratio of RH negative type A, type B, type O and type AB is 3: 3: 3: 1. This is why panda blood is so precious.
Old people in nursing homes live a lonely life without children to take care of them. We often visit them when we have time. What