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Sphincters - The Fascinating Truth

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Danielle
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Sphincters -- they're not just for butts! Hank explains the fascinating truth about these magic rings of muscle, where they appear in the human body and the pretty fantastic functions they perform in the animal kingdom.

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Sources:
SOURCES
http://www.vetmed.vt.edu/education/curriculum/vm8304/lab_companion/histo-path/vm8054/labs/Lab25/NOTES/WHALNOSE.HTM - blowhole
http://www.nlm.nih.gov/medlineplus/ency/article/003983.htm - artificial sphincter
http://www.wisegeek.org/what-is-a-sphincter.htm
http://phenomena.nationalgeographic.com/2013/11/06/cyborg-bladders-stop-incontinence-in-rats-after-spine-damage/
http://health.nytimes.com/health/guides/symptoms/urinary-incontinence/print.html
https://www.savethekoala.com/about-koalas/physical-characteristics-koala
http://europepmc.org/articles/PMC1262097/pdf/janat00171-0135.pdf
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Documentary
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