Multiple Choice
Which of the following steps of vitamin B-12 absorption occurs in the stomach?
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23. The Digestive System
The Stomach
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What function does the low pH of the stomach serve in the digestive system?
A
It facilitates the absorption of nutrients in the small intestine.
B
It activates pepsinogen into pepsin for protein digestion.
C
It neutralizes the acidic chyme from the stomach.
D
It protects the stomach lining from mechanical damage.
Verified step by step guidance1
Understand the role of stomach acid: The stomach secretes hydrochloric acid (HCl), which creates a low pH environment.
Recognize the importance of enzyme activation: Pepsinogen, an inactive enzyme precursor, is converted into pepsin in the presence of low pH, which is crucial for protein digestion.
Consider the digestive process: Pepsin breaks down proteins into smaller peptides, facilitating further digestion and absorption in the small intestine.
Evaluate the options: The low pH does not directly facilitate nutrient absorption in the small intestine, neutralize chyme, or protect the stomach lining from mechanical damage.
Conclude the primary function: The low pH of the stomach primarily serves to activate pepsinogen into pepsin, enabling effective protein digestion.
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