The Pharoh and The Sphincter Muscle


Sphincter

Sphincter

 

sphincter (sfngktr)

A ring-shaped muscle that encircles an opening or passage in the body. The opening and closing of the anus is controlled by contraction and relaxation of a sphincter, as is the opening that leads to the stomach from the esophagus.

~ by Vinnie on March 21, 2009.

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