Multiple Choice
Which of the following animals uses only intracellular digestion?
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39. Digestive System
Digestion
Multiple Choice
How is the stomach lining protected from the strongly acidic pH of its contents?
A
It releases a hormone called gastrin, which stops gastric juice secretion.
B
Bile neutralizes the acid soon after it enters the stomach.
C
Parietal cells secrete a protective buffer to neutralize hydrochloric acid.
D
The acid is neutralized quickly when it combines with pepsinogen to make pepsin.
E
Mucous cells secrete a protective lubricant into the stomach.
Verified step by step guidance1
Understand the role of the stomach in digestion: The stomach is responsible for breaking down food using gastric juices, which include hydrochloric acid (HCl) that creates a highly acidic environment.
Identify the problem: The stomach lining needs protection from the acidic environment to prevent damage to its tissues.
Explore the protective mechanisms: The stomach has specialized cells called mucous cells that secrete mucus, a thick and protective lubricant, which coats the stomach lining.
Clarify the function of mucus: This mucus acts as a barrier between the stomach lining and the acidic gastric juices, preventing the acid from damaging the epithelial cells of the stomach.
Recognize the importance of mucus secretion: Without this protective mucus, the stomach lining would be susceptible to ulcers and other forms of damage due to the corrosive nature of hydrochloric acid.
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