Why Doesnt Your Sphincter Get Tired

Keeping a muscle clenched usually tires it out eventually, but thats not the case for sphincters, which do things a little differently. Hosted by: Hank Green Head to for hand selected artifacts of the universe Support SciShow by becoming a patron on Patreon: Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Sam Lutfi, D. A. Noe, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, Tim Curwick, charles george, Kevin Bealer, Chris Peters Looking for SciShow elsewhere on the internet Facebook: Twitter: Tumblr: Instagram: Sources: