alleryStart learning →Hydrochloric acid gives the stomach contents their high acidity. What pH range does it produce?
AA pH of 6.35 to 6.85
BA pH of 7.4 to 7.8
CA pH of 1.5 to 3.5
DA pH of 7.6 to 8.6
Answer & Solution
Correct answer: C. A pH of 1.5 to 3.5
1. Parietal cells secrete hydrochloric acid into the lumen of the stomach.
2. That acid holds the stomach contents at a pH of 1.5 to 3.5.
3. The low pH activates pepsin, kills many ingested bacteria and denatures proteins.
4. A pH of 6.35 to 6.85 is the buffered range of saliva.
5. The ranges 7.4 to 7.8 and 7.6 to 8.6 belong to intestinal juice and bile, both alkaline.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 23 "The Digestive System", section 23.4 The Stomach_
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