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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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There are 60,000 miles of blood vessels in every adult human.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.