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10 Little Known Facts About Blood

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Considering our close relationship with it, many may be surprised to learn they don't know as much about it as they thought. Here are 10 little known facts about blood.

Considering our close relationship with it, many may be surprised to learn they don't know as much about it as they thought.
Here are 10 little known facts about blood.

Number 10. It accounts for 7 to 8 percent of human body weight. In liquid measure, it amounts to around 5 liters, over half of which is plasma.

Number 9. A newborn has about one cup of blood. Should more ever be needed, it can only come from adults who have never been exposed to the fairly common cytomegalovirus, or CMV, as some infants are particularly vulnerable to it.

Number 8. People with type O blood are more attractive to mosquitoes. That means about 45 percent of the population is considered tastier than the rest.

Number 7. Cows have 800 possible blood types. Humans only have 4 -- A, B, AB, and O. Even if you factor Rh negative and positive aspects, that's still only 8 options.

Number 6. In the United States, somebody needs blood every two seconds. That means to keep up with demand, 41 thousand daily donations are needed.

Number 5. A typical donation is 1 tenth of a person's total supply. Of the 10 pints coursing through the average person's veins, only 1 pint is generally taken at a time. The body recoups the plasma loss in about a day. Full red blood cell counts bounce back within a couple of months.

Number 4. Human blood has over 4 thousand components. The most popular are the 4 we all know: red cells, white cells, plasma and platelets.

Number 3. In the donations category, the Guinness World Records title holder is John W. Shepphard. As of 2011 when he claimed the title, he'd donated 315 whole blood units.

Number 2. O negative blood can be given to anybody. Unfortunately for them, they can only receive 0 negative themselves. According to the American National Red Cross, it's estimated that only 7 percent of humans have that type.

Number 1. There are many types of blood donations. People can give whole blood, or its separate components. Plasma, red blood cells, and platelets are three common variations. The process of giving specific parts is called apheresis.
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