What strong acid in the stomach helps to break down food, activates pepsinogen, and kills ingested microbes?
1. Lactic acid
2. Acetoacetic acid
3. Carbonic acid
4. Hydrochloric acid
Correct Answer: 4
Rationale 1: Lactic acid is a byproduct of anaerobic metabolism.
Rationale 2: Acetoacetic acid is a byproduct of starvation.
Rationale 3: Carbonic acid is part of the buffer system.
Rationale 4: Hydrochloric acid is secreted by the parietal cells of the stomach.
Global Rationale: Hydrochloric acid is secreted by the parietal cells of the stomach and helps to break down food, activates pepsinogen, and kills microbes that may have been ingested. Lactic acid is a byproduct of anaerobic metabolism. Acetoacetic acid is a byproduct of starvation and carbonic acid is part of the buffer system.
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