The wall of the alimentary canal is comprised of both skeletal and smooth muscle fibers that function in movement and mechanical digestion. Which segment of the alimentary canal contains skeletal muscle fibers?

Question

Quizplus · Accepted Answer

The upper third of esophagus is entirely skeletal while the middle third is comprised of a mixture of skeletal and smooth muscle fibers. The skeletal muscle in the esophagus make up sphincters. The lower sphincter works to prevent the reflux of the acidic contents of the stomach.
The lower third of the esophagus up to large intestine is entirely made of smooth muscle fibers.

The Wall of the Alimentary Canal Is Comprised of Both