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Cells that are rapidly undergoing mitosis constantly repair and renew the lining of the pharynx and the esophagus, which is particularly vulnerable to abrasion associated with swallowing. Which of the following terms best describes this lining?

a.serosa
b.muscularis externa
c.submucosa
d.mucosa

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Answer:

d. mucosa

Explanation:

The pharynx and esophagus possesss all of the basic histological layers of the gastrtointestinal tract (GI tract). The layers are:

  • mucosa - layer closer to lumen which cocnsists of epithelium, lamina propria and muscularis mucosae
  • submucosa-layer of loose connective tissue with vessels
  • muscularis propria-layer of inner circular and outer longitudinal muscular layers
  • adventia - layer of  loose connective tissue

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