Question

what are sphincter museles​

Answer 1

Answer:

A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning.  There are over 60 types in the human body, some microscopically small, in particular the millions of precapillary sphincters.

Explanation:

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Answer 2

Answer:

sphincter muscles any of the ring like muscles surrounding and to contract or close bodily passage or opening.

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