Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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There are 20 feet of blood vessels in each square inch of human skin.
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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
Two mechanisms that affect cell shape and movement.
A Prokaryotic Cell
Microfilaments and Cell Movements
Eukaryotic Cell
Hematocrits, left to right: normal, anemia, polycythemia.