The Heart
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How Does the Heart & Circulatory System Work? (Video)
Watch this movie about your heart and circulatory system, which sends blood throughout your body.
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Quiz: Heart & Circulatory System
Take this quiz about the circulatory system, which sends blood throughout your body.
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Heart Murmurs
Everyone's heart makes sounds, but some people have hearts that make more noise than others. Usually, however, these heart murmurs don't mean anything is wrong. Find out more about these mysterious murmurs.
