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Cholesterol is a soft, waxy substance found in all parts of the body.
It helps form cell membranes and is involved in production of some hormones and vitamin D.
Excess cholesterol can build up in the arteries, narrowing them and slowing or
blocking blood flow to the heart. To learn more, take this quiz based on information from the National Heart,
Lung and Blood Institute and the American Heart Association.
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More than 14 million Americans have been diagnosed with diabetes and almost seven million more have diabetes but don't realize it, according to the CDC. Yet diabetes is the sixth leading cause of death in the United States. Test your knowledge of this chronic disease by taking this multiple-choice quiz.
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Test your knowledge of first aid by taking this quiz.
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Which habits can harm your vision? Learn about them by taking this quiz.
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Stroke is the third leading cause of death after heart disease and cancer and a
leading cause of serious, long-term disability, according to the American Heart Association (AHA). Strokes kill about 157,000 people a year, accounting for about 1 of every 15 deaths. Find out more about stroke by taking this quiz, based on information from the AHA and the National Institute of Neurological Disorders and Stroke (NINDS).
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