What is a sphincter?
The sphincter is a circular band of voluntary or involuntary muscle that encircles an orifice of the body.
Answered by Hazel C. -
Older Answers
A sphincter (noun) means a ring of muscle that contracts to close an opening. Synonyms are anatomical sphincter, sphincter muscle. ChaCha!
Answered by Lyndsey W. -
It is something in the anus!
Answered -
The internal and external anal sphincters are rings of muscle at the opening of the anus. The sphincters keeps the anus closed as fecal matter collects in the rectum. Thanks for asking ChaCha!
Answered -
A Sphincter is an annular muscle surrounding and able to contract or close a bodily opening. Thanks!
Answered by Wing L. -
A sphincter is a ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Cha cha!
Answered by Peggy L. -
A muscular ring that closes a bodily opening
Answered by Channing C. -
A sphincter is an annular muscle surrounding and able to contract or close a bodily opening. Thanks for using ChaCha!
Answered by Caroline B. -
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