The longest a person has survived after a heart transplant is 24 years.
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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 B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Titan's dense atmosphere shrouds the moon beneath a tan haze in this image.
Honey Moon
The Pyramid of the Moon, looking north up the Avenue of the Dead.