Multiple choice

The lining wall of the alimentary canal appears different in different parts of the gut, reflecting their different roles, but always has the same basic layers. Which of the following layers prevents food from traveling backward?

  1. The muscularis externa

  2. The gastric mucosa

  3. The submucosa

  4. The serosa

  5. The oral mucosa
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A Correct answer
Explanation

The muscularis externa consists of an inner circular layer and a longitudinal outer muscular layer. The circular muscle layer prevents food from traveling backward and the longitudinal layer shortens the tract.

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