Assertion: urethra's sphincter | /r/HasProperty | smooth muscle
Facets:
Source sentences:
text: internal urinary sphincter: smooth muscle at the juncture of the bladder and urethra; relaxes as the bladder fills to allow urine into the urethra
text: This sphincter is smooth (involuntary) muscle.
text: anatomical sphincter: smooth or skeletal muscle surrounding the lumen of a vessel or hollow organ that can restrict flow when contracted