Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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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.
The tracheal system of insects.
Polaris system
Anatomical Charts Muscular System
Gastrointestinal system
Negative feedback control of a regulated variable.
