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Did you know?
More than 4.4billion prescriptions were dispensed within the United States in 2016.
Did you know?
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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.