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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
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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.