Heather Whipps, LiveScience Contributor | March 22, 2012 03:42pm ET
You use your eyes to see, your ears to hear and your muscles to do the heavy lifting. Well, sort of. In fact, most body parts are far more complicated than that, while some seem to have no business being inside there at all.
Find out how much you know about the body's parts and what they do (or don't do).