When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Everyone has one nostril that is larger than the other.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Symptoms that are most common in toxic spider bites
Common pathogens and some infections
Common STIs in the United States
Common skin signs are often evidence of an illness or disorder. A pustule is a small, elevated, ...
Common Abbreviations and Symbols Used by Massage Therapists Cont.
Common Abbreviations and Symbols Used by Massage Therapists Cont.