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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.