How is the stomach lining protected from the strongly acidic pH of its contents?
a. Mucous cells secrete a protective lubricant into the stomach.
b. It releases a hormone called gastrin, which stops gastric juice secretion.
c. Bile neutralizes the acid soon after it enters the stomach.
d. Parietal cells secrete a protective buffer to neutralize hydrochloric acid.
e. The acid is neutralized quickly when it combines with pepsinogen to make pepsin.
Answer: a. Mucous cells secrete a protective lubricant into the stomach.
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