What are sphincters ? why there malfunctioning is dangerous?
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Sphincters are special, circular muscles that open and close certain body parts. Most often, the action of a sphincter is to regulate the passage of some type of fluid, such as bile, urine or fecal matter.
The action of sphincters may happen involuntarily through the autonomic nervous system or maybe under some voluntary control through the somatic nervous system.
If a sphincter loses muscle tone or has too much tone (spasticity), symptoms and/or illness can follow, such as urinary retention and bladder and fecal incontinence
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