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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.