The science of how Messi keeps the ball close to himself photo credit: ZaleDesigns Messi is a magician with the ball at his feet. He's in my opinion the best player in the sense that he can control the ball so well, runs so fast with the ball & changes the direction at full speed like it's a walk in the park. For starters he started playing very early (at 3) which is crucial if you want to be a good player. In that aspect, he's God gifted as he had dribble skills which is genetic in my opinion. Height He is short which means a low center of gravity so it's difficult to push him off the ball. That's why we see that anyone rarely can topple him down, instead players much larger than him lose possession to him. So his short height suits his style of play & is a blessing in disguise. Change of pace Messi changes his pace really well. He starts slow and runs directly at the defender which means the defender has to stop & focus on him. When he reac...
Blood Group
Introduction
Based on the presence and absence of antibodies, the blood is classified into different groups.
Further, while classification, the presence and absence of the inherited antigenic substances also considered.
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| different blood groups |
The types of blood groups are inherited and represent contributions from both the father and the mother.
ABO Blood Group System
In human blood, usually, there are two antigens and antibodies.
The two antigens are antigen A and antigen B.
The two antibodies are antibody A and antibody B.
The antigens are remaining in the red blood cells, whereas the antibodies are found in the serum.
Based on the antigen property, the blood group of all human beings can be classified as −
Blood Group A − antigen A and antibody B
Blood Group B − antigen B and antibody A
Blood Group AB − antigen A and antigen B and no antibody
Blood Group O − no antigen, but antigen A as well as antibody B
Consideration of the ABO system is the most imperative while transfusion of human blood.
The ABO blood group systems were first discovered by Karl Landsteiner in 1901.
Rh Blood Group System
The Rh system (the meaning of Rh is Rhesus) is another significant blood-group system. It is very important to match Rh system while blood transfusion.
Rh antigen first studied in Rhesus monkeys; therefore, its name is given Rh factor/system.
The person who does not have Rh antigen is known as Rh negative (Rh-ve) and the person who has the Rh antigen is known as Rh positive (Rh+ve).
Blood Transfusion
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| blood transfusion |
Based on the above discussed two blood grouping system (i.e. ABO and Rh), the following table illustrates the possibilities of blood transfusion among different blood groups −
| Recipient | Donor | |||||||
|---|---|---|---|---|---|---|---|---|
| O- | O+ | A- | A+ | B- | B+ | AB- | AB+ | |
| O- | Yes | No | No | No | No | No | No | No |
| O+ | Yes | Yes | No | No | No | No | No | No |
| A- | Yes | No | Yes | No | No | No | No | No |
| A+ | Yes | Yes | Yes | Yes | No | No | No | NO |
| B- | Yes | No | No | No | Yes | No | No | No |
| B+ | Yes | Yes | No | No | Yes | Yes | No | No |
| AB- | Yes | No | Yes | No | Yes | No | Yes | No |
| AB+ | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Conclusion
Based on the blood transfusion table given above the blood group O- is the universal donor, which can give blood to the person of any blood group.
Secondly, the blood group AB+ is the universal recipient, as it can accept blood from the person of any blood group.
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