#involuntary_muscle__involuntarymuscle__smooth_muscle  a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)
  supertype:  #muscle__musculus  one of the contractile organs of the body
  subtype:  #myometrium  the smooth muscle forming the wall of the uterus
  subtype:  #musculus_sphincter_ani_internus  an internal ring of smooth muscle formed by circular fibers of the rectum

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