I don't remember how I stumbled on this gem--I would like to believe it was by searching "inside-out kid's body," but that's just wishful thinking. This is my favorite page, but the rest is worth a look too, especially the Headstand page and the true-falses. There is a spring in the eldow joint!
ETA: Oh my god there is a whole website of these informational toons! Don't put the coat on the snowman, it will melt him.