Biology 1‎ > ‎

Cells

At a microscopic level, we are all composed of cells. Look at yourself in a mirror -- what you see is about 10 trillion cells divided into about 200 differen­t types. Our muscles are made of muscle cells, our livers of liver cells, and there are even very specialized types of cells that make the enamel for our teeth or the clear lenses in our eyes!

If you want to ­understand how your body works, you need to understand cells. Everything from reproduction to infections to repairing a broken bone happens down at the cellular level. If you want to understand new frontiers like biotechnology and genetic engineering, you need to understand cells as well.


"How Cells Work" Science.HowStuffWorks.com. Marshall Brain.  16 October 2013 <http://science.howstuffworks.com/life/cellular-microscopic/cell.htm>


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