In the digestive and urinary systems,rings of smooth muscle,called ________,regulate the movement of materials along internal passageways.
A)circular muscles
B)longitudinal muscles
C)muscularis mucosae
D)sphincters
E)the muscular layer

Question

Quizplus · Accepted Answer

Sphincters are rings of smooth muscle that regulate the movement of materials along internal passageways, specifically in the digestive and urinary systems. The other options are not specific to sphincters or their function.

In the Digestive and Urinary Systems,rings of Smooth Muscle,called ________,Regulate