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Conduction System

The heart is a beating muscle that continually pumps blood to the rest of the body. What we commonly call a heartbeat is actually the rhythmic contraction of the heart's four chambers. Each heartbeat ...
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Many Teens 'Vaping' for Flavor, Not Nicotine

Study found that only about a fifth of 12th graders who used an e-cigarette used a nicotine substance

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