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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In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
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The longest a person has survived after a heart transplant is 24 years.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
