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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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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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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
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Everyone has one nostril that is larger than the other.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.