what is spincher muscle
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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..
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☆A sphincter is a muscle that surrounds a body opening (the urethra or the anus, for example) and which should unconsciously remained tightly closed.
☆ During urination, sphincters relax and open when messages are relayed from your nerves and your brain to the pelvic floor muscles.
☆ Internal and external sphincter muscles control the storage and voiding of urine.
☆The internal sphincter instinctively squeezes the urethra closed.
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