Keeping a muscle clenched usually tires it out eventually, but that’s not the case for sphincters, which do things a little differently.
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Head to for hand selected artifacts of the universe!
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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
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