Question

what is sphincter muscle?​

Answer 1

Answer:

Listen to pronunciation. (SFINK-ter) A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).

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Answer 2

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.