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What is a ring of skeletal muscle that regulates the movement of a bolus into the esophagus?

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What is a ring of skeletal muscle that regulates the movement of a bolus into the esophagus?

What is a ring of skeletal muscle that regulates the movement of a bolus into the esophagus?
A) glottis
B) upper esophageal sphincter
C) epiglottis
D) lower esophageal sphincter
E) pyloric sphincter

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