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  • Heart and Circulatory System

    ... the heart. It enters the heart in the left atrium, then fills the left ventricle
    so it can be pumped into the systemic circulation. ...

  • E-Cigarettes

    ... It was once even used as an insecticide to kill bugs. Nicotine affects your brain,
    nervous system, and heart. It raises blood pressure and heart rate. ...

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