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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.