Sphincters – The Fascinating Truth
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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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
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