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Q: Hydrochloric acid in the stomach provides the acidic pH of ........ which is optimal for pepsins.
  • A. 3.8
  • B. 1.8
  • C. 5.8
  • D. 7.8
Correct Answer: Option B - The main constituent of gastric acid is hydrochloric acid produced by parietal cells in the gastric glands in the stomach. Parietal cells contain an extensive secretory network called (canaliculi) from which the hydrochloric acid is secreted into the lumen of the stomach. The pH of gastric acid is 1.5 to 3.5 in the human stomach lumen, a level maintained by the proton group H+/K+ ATPase.
B. The main constituent of gastric acid is hydrochloric acid produced by parietal cells in the gastric glands in the stomach. Parietal cells contain an extensive secretory network called (canaliculi) from which the hydrochloric acid is secreted into the lumen of the stomach. The pH of gastric acid is 1.5 to 3.5 in the human stomach lumen, a level maintained by the proton group H+/K+ ATPase.

Explanations:

The main constituent of gastric acid is hydrochloric acid produced by parietal cells in the gastric glands in the stomach. Parietal cells contain an extensive secretory network called (canaliculi) from which the hydrochloric acid is secreted into the lumen of the stomach. The pH of gastric acid is 1.5 to 3.5 in the human stomach lumen, a level maintained by the proton group H+/K+ ATPase.