How the Heart Works
Intoduction to How The Heart Works
Your heart is an amazing organ. It continuously pumps oxygen and nutrient-rich blood throughout your body to sustain life. This fist-sized powerhouse beats (expands and contracts) 100,000 times per day, pumping five or six quarts of blood each minute, or about 2,000 gallons per day.
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http://www.medicinenet.com/heart_how_the_heart_works/article.htm
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