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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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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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The longest a person has survived after a heart transplant is 24 years.