Why doesn't the stomach digest itself?
A. Mucosal epithelial cells are exceptionally long-lived.
B. Parietal cells secrete a thick mucus that protects the mucosa.
C. Excess stomach acid is regurgitated.
D. Gastrin stimulates production of mucus.
E. Stem cells in gastric glands constantly replace dead epithelial cells of the mucosa.
Answer: E
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A cross section of the digestive tube reveals four major tissue layers: (from the innermost layer outward) the mucosa, the __________, the muscularis externa, and the __________
Fill in the blank(s) with correct word
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