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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).