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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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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Thyroid conditions may make getting pregnant impossible.