Which circular muscle found in tubular structures regulates the passage of substances?
A) Lumen
B) Sphincter
C) Leaflet
D) Vegetation
E) Valve

Name: Which circular muscle found in tubular structures regulates the passage of substances? A) Lumen B) Sphincter C) Leaflet D) Vegetation E) Valve
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Question

Quizplus · Accepted Answer

Sphincters are circular muscles located in tubular structures throughout the body, such as the gastrointestinal tract, that regulate the passage of substances by contracting or relaxing.

Which Circular Muscle Found in Tubular Structures Regulates the Passage