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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.