Urine is prevented from leaving the bladder prematurely by two rings of muscle: one is the voluntarily controlled _____, which can be assisted by contraction of the _____.

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.


1. Urine is prevented from leaving the bladder prematurely by two rings of muscle: one is the voluntarily controlled _____, which can be assisted by contraction of the _____.