The Fascinating Truth About Sphincters

By Jamie Condliffe on at

The word sphincter conjures one very distinct image in our heads. But did you know there are actually about 50 different types of sphincter throughout our body?

No, of course you didn't. In fact, there's more to these rings of muscles than keeping your poop inside rather than out. This video explains why they're there—and how they're so useful, too. [YouTube]