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 among the following layers prevents food from travelling backwards?

  1. The oral mucosa

  2. The serosa

  3. The submucosa

  4. The gastric mucosa

  5. The muscularis externa
Reveal answer Fill a bubble to check yourself
E 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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