What is meant by different blood types?
When you go to a hospital you are given a number of tests. Chances are the experts will take a sample of your blood. They will find out and perhaps tell you the blood type to which you belong. You may belong in book group 0 or a, in b or in ab. At one time a doctor had to know your blood type if he planned to perform an operation. The bright red color of blood comes from billions of swarming cells called corpuscles. There are so many of these little round midgets that you might think blood is made entirely of red corpuscles. But this is not so. There are also assorted white blood cells. And red cells and white cells all float freely in a stream of strawcolored liquid called blood plasma. At one time operations were very risky because so many patients died from loss of blood. Then it was discovered that a healthy person could give or donate some of his blood to the victim of an accident or to someone recovering from surgery. This exchange was called a blood transfusion and it did not al
