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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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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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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.