There are twenty-four different blood types known. The most common blood types known are A, B, AB, and O. The knowledge of blood types has saved so many people’s lives. Blood types are also called blood groups. Blood types are inherited, and they never change. Everybody has a blood type. All human blood looks alike, but once tested it shows the differences between the blood.
The letters A, B, AB, and O stand for two antigens labeled A and B. Antigens are substances targeted by the immune system. Group A only has A antigens, group B only has B antigens, group AB has both, and group O has neither. Different races have different percents of blood types, for example, whites may have more O's than blacks do. Below there is a chart of the blood type percents for the different races:
White African American Hispanic Asian
O + 37% 47% 53% 39%
O - 8% 4% 4% 1%
A + 33% 24% 29% 27%
A - 7% 2% 2% 0.5%
B + 9% 18% 9% 25%
B - 2% 1% 1% 0.4%
AB + 3% 4% 2% 7%
AB – 1% 0.3% 0.2%......

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Title: Blood Types
Approximate Word Count: 443
Approximate Pages: 2 (250 words per double-spaced page)

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